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I have a Compaq Presario with a bestec atx-300-12z power supply. When i plug the computer in, the green light goes on but as soon as i press the power button the light goes off and pc doesn't start.

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  • Compaq Master
  • 3,888 Answers

Dead PC, PC fans totally dead
that most times means PSU dead, or shorted modules inside PC> (im sure the power switch wire, to the mobo did not fall off) and the green LED on back of PSU is glowing green , (per manual HP ) means AC power side is good.

SR1200 series desktop made in fact in the Compaq plant in Texas.
2004 newest 2002, oldest.
if the coin cell is that old, it is bad.
none ever last that long; 14 years to 16year old batteries are no good. but a DMM check will not lie to you. 2.9v min, lower bad.

If both fans are dead , the PSU is bad.
in some cases, (no pun) we open the case
power off, (ac cord pulled)
push power on to discharge all caps in the PC,
normally one sees the CPU fan spin for 1 seconded and die. (but that is good PC yours is not)

we remove all power wires from the PSU from it
to HDD, to CD, drives, and to floppy 4 pin power
we do that because shorted devices, cause all PSU to shut down. even in 1/2 of second or LESS.
by design (ATX spec) this prevents fire, in the case/psu.
plug in PC, AC and push power, do fans run now, both must run , not just one fan.
power off again, ac line pulled, push power button again, to discharge things,
now

The once all those pig tails from PSU to THINGS are pulled , but not your MAIN 20 pin connector to mobo
we do what, we remove ram and test each stick 1 by one.
doing same tests, AC line pulled. remove RAM.
but 1 stick reseat it, and test for power on again.

if you have the original DDR memory sticks test them 1 by 1, each. ok>? they can short too. I have a Compaq Presario with a bestec atx-300-12z - 94c62a99-50e0-4817-b127-42fc295914d0.jpg

Posted on Sep 17, 2018

  • 10 more comments 
  • Erik Carlson
    Erik Carlson Sep 18, 2018

    I don't think the battery is the issue. I've had the computer for many years and it died about 2 years ago. About a month ago I went thru the diagnostic steps with it and it was suggested that the memory might be the problem. I removed the added memory and it fired right up. Then, just to see, I reinstalled the extra memory and it worked fine. It ran for over a week with no problem. When this recently happened, I removed all added hardware including ram, video card and Wi-Fi card. Still wouldn't start. Haven't seen the bios since out does nothing when I press the power button except force the light off on the power supply. I even unplugged the motherboard and disc drive and it did the same thing. I'm leaning towards the power supply and the power switch.

  • Larry Ng
    Larry Ng Sep 18, 2018

    what PC? what model is it, it has number
    associated with the word name Persario.
    I can't help you blind. ok>?
    if not 1993 made, this works.
    or 1999 Compaqs with baby ATX PSu's
    so unplug the PSU power connector, 24pins
    then jump the 2 pins seen in the link I made below. this tests the PSU. (an unloaded test 1)
    you jump the pins and the FAN in the PSU turns on, (i guess all fans are dead right?)
    and then with any voltmeter, measure all the pins,
    black wires on the connector are ground .
    then with meter , check
    +5v
    +12v
    and +3.vdc pins.
    all must read IN SPEC, per that same linked page below shows the actual spec, on pins.http://www.pcdied.com/power.html#rapid_t...

    own a DMM meter, from walfart for $20 , a life time of usage.
    measure the coin cell, too.
    They do not last decades, just 7 years,
    if parked on shelf for 7 years, they go dead faster. (higher drain, not turned on)

    wish I knew what Compaq Presario this is
    Destop, lots and lots of models. 1993 to 2013.
    the tag on the side of the case tell us what it is and how old it is.
    most are very very old and the coin cells do not last that long. (it's a first things first thing that COIN)



    let me quote the wiki to you. so you know just how blind you made me in this text box.
    the word Presario means little, in the year 2018
    its like saying I own a FORD, (model T?)

    quote
    Under Pfeiffer's tenure as chief executive, Compaq entered the retail computer market with the Compaq Presario as one of the first manufacturers in the mid-1990s to market a sub-$1000 PC
    the service tag , looks like this.http://www.pcdied.com/TAG-jive/hp%20tag-...

    if the this PC is ATX spec.
    and if the main power connector DC is 24 pins
    and not 20pins
    jump pin 16 to 17 and the PSU turns on.
    unplug all PSU power wires,inside PC
    including the 24 pin huge connector .
    then jump the 2 pins seen here
    this page shows the relic ATX PCs with 20 pins and how to jump that , if is that.http://www.pcdied.com/power.html#rapid_t...

  • Larry Ng
    Larry Ng Sep 18, 2018

    to be complete as the linked page covers.
    the PSU can also go dead
    if the power switch is broken.
    or the wires to it on either end fell off or are damaged.
    one can hot jump the 2 pins the switch as 2 the wires go and land on the mobo , and turn any PC on.
    ask,

    I can answer if you tell what PC this is
    what Persario model is it?

  • Anonymous Sep 18, 2018

    27th August 1993
    Compaq Introduces Presario

  • Anonymous Sep 18, 2018

    post a photo of it.
    look on sides for tag read tag
    the front may have number like 2500
    or rear has model number.
    there is a model number for sure.
    all this is first things, we can not help
    guessing 1993 to 2013 compaqs.

  • Erik Carlson
    Erik Carlson Sep 19, 2018

    I'm new to this message board, so forgive me if I'm posting in the wrong spot. The model number to this presario is SR1280NX. Yep, it's an older one but worked pretty well for me after putting in a video card, WiFi and more memory. I was reading the link about testing the psu and could follow most of it but it's been a while since I've worked on computers. I'll have to sit down this weekend and try to follow the steps. I'll need a different DMM since mine is kind of specific to my work. (Solar) it doesn't do very well with lower voltages. I really appreciate all of the suggestions and input. You guys are awesome. I'll also pick up the small battery because I'm sure it's way beyond it's useful life. I'll post results of what I do and find, as best I can. Any other advice is greatly appreciated. Thanks guys.

  • Larry Ng
    Larry Ng Sep 19, 2018

    that's AOk, fixya does not have all 100,000 models of pC listed, so only get maker name correct. is possible, HP is it one , if older than 2002, Compaq is another. SR1280NX
    ok that is clear,
    seems yours was made year 2003'
    about same moment HP took over COmpaq,
    so is really a full blown Compaq.

    it is a SR1280 and SR1820, right? note how easy it is to transpose those numbers.

    if the fans are dead, both, cpu and PSU fans'
    I'm posting on just that,dead fans. ok>?
    both are dead, power on.(power button dead)

    the PSU is most times bad in this case.

    but this PC is super old and uses very very old PSU, that uses a mix of power connectors
    IDE (pata) drives power, and SATA drive power cables, ATX in Transition to the modern world PSU, and are harder to find, but we can buy adaptors now. easy. not cheap at $5 a pop.
    and add up fast. and the Floppy drive power, do you need that?
    the main power connector only (i see it)
    is 20pin no 24, so only PC with that count
    or the transitional PsU have split connector.
    that original PSU has green led on the rear
    that most glow green does it.?


    Pentium® 4 Processor , very old
    the service manual is dated 2002 to 2004
    yes old.
    PSU match up are possible (transitional ATX)
    the beach test for just fan dead, is just 2 pin jump, on your 20 pin the pins are 13 to 14
    as seen here.http://www.pcdied.com/PSU/PSU2.JPG

    https://www.amazon.com/Supply-Upgrade-PR...

    bingo?>
    see this, the SR1200 series, from 16 year agao?

  • Larry Ng
    Larry Ng Sep 19, 2018

    are not photos amazing things? (clearly old 2002 compaq,(i think built in 3 year run.
    the motherboard inside is made by famous, company now, ASUS, under contract, from Compaq to ASUS and is marked A78X-LA.
    seen here. the mobo manual in full
    an nice book to use to not get wrong memory inside. (so easy to do now, this old)
    SR1200 series, right?
    https://www.manualslib.com/manual/637819...

  • Anonymous Sep 19, 2018

    do not put in parts inside this PC with the PSU
    plugged into the wall, or you blow up parts.
    PC do not turn off fully when off.
    called standby power, so must be
    pulled from wall AC
    the push power button to discharge caps
    then pull things. (SOP standard op. procedures)
    and even told in the mobo manual. and in HP manuals.

    and good luck running the XP virus magnet on any PC.

  • Larry Ng
    Larry Ng Sep 19, 2018

    Most PCs this old have many problems.
    bad coin cell, for sure, if that old.
    bad hdd (old relic PATA IDE drives)
    XP virus magnet, (pure H3LL now)
    bad monitors, that old the CCFL tubes are dead.
    wrong ram used, very common . or bad or shorted.
    PSU bad,
    bad fans, and overheats. (both must be good)

    even bad MOBO is possible, but I think not.

  • Erik Carlson
    Erik Carlson Nov 24, 2018

    I might be posting this in the wrong spot, but I wanted to let everyone know that I finally had the time to put a new power supply in. I replaced the original with a new 500w and it fired right up. Woohoo! Thank you everyone for your suggestions. It was all very helpful.

  • Anonymous Nov 24, 2018

    thanks for feed back ,rare here.
    A bad PSU is very common when this old.
    http://pcdied.com/dead-PC.html

    if ***** MOBO fails, PSU is top of list
    if that fails, all things plugged in to the MOB are suspected next (all PSU shut down for rail shorts) in 1 second or less time.(atx spec)

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  • Compaq Expert
  • 416 Answers

Pull the battery out and then plug it in and see if it starts. someimes the batteries short out and the computer will not start that is if it is a laptop

Posted on Sep 16, 2018

Testimonial: "It's actually a desktop. Would taking the little backup battery out be the same, or do you mean the large battery on a laptop?"

  • 6 more comments 
  • Erik Carlson
    Erik Carlson Sep 17, 2018

    It's actually a desktop. Would taking the little backup battery out be the same, or do you mean the large battery on a laptop?

  • Minister Ruland Sep 17, 2018

    inside the desktop there is a small 2032 watch battery and if you pull it out and unplug it then it will reset and I have had to do this sometimes for it would not start. sometimes that will fix it. laptops have the small battery untder the key board for time\date backup like the desktops do

  • Anonymous Sep 17, 2018

    Compaq Presario means little, sold as both desk and laptops, and has model number.
    that if told tell me how old it is and if the RTC battery crossed the 7 year magic line of deathh


    roland finally moves to current post wow.
    the PSU is bad.,
    or the PSU is overloaded.
    we bench test PSU, ask.

    the coin cell is $2.
    buy one,
    or use a voltmeter (DMM)
    2.9 or below is bad, 3.3vdc is new.

  • Anonymous Sep 17, 2018

    under desktops see this, and click each and 100s of models. not one can we ever guess,
    sorry !
    but sure RTC coin cell batteries do not last forever, nor the HDD.

    the jumper test for PSU is here
    http://www.pcdied.com/power.html#rapid_t...

  • Erik Carlson
    Erik Carlson Sep 19, 2018

    I'm new to this message board, so forgive me if I'm posting in the wrong spot. The model number to this presario is SR1280NX. Yep, it's an older one but worked pretty well for me after putting in a video card, WiFi and more memory. I was reading the link about testing the psu and could follow most of it but it's been a while since I've worked on computers. I'll have to sit down this weekend and try to follow the steps. I'll need a different DMM since mine is kind of specific to my work. (Solar) it doesn't do very well with lower voltages. I really appreciate all of the suggestions and input. You guys are awesome. I'll also pick up the small battery because I'm sure it's way beyond it's useful life. I'll post results of what I do and find, as best I can. Any other advice is greatly appreciated. Thanks guys.

  • Larry Ng
    Larry Ng Sep 19, 2018

    BINGO SR! 1200 series it seems.
    the fans are dead right, both fans dead
    in the rear of the PSU,see that grill
    see fan spin, feel it , hear it?
    same with CPU, is the fans both dead.
    if yes, that means total power failure.

    we STRIP PCs down to prove modules, (all) are not shorted.
    this is next.
    if these checks fail to get fans on,
    time for new PSU.

  • Larry Ng
    Larry Ng Sep 19, 2018

    the fact it ran for 16 year is amazing
    ever seen woody allens movie SLEEPER
    where he goes to year 2000 finds VW bug running, (Diane K was hot, !!!!)
    same here, a KODAK moment the day before it died. sorry for jokes, but it is old.
    so old some ran WINDOWS 2000 (w2k)
    The sleeper version. hahahahaha

  • Erik Carlson
    Erik Carlson Nov 24, 2018

    I thank all of you for your comments and suggestions. They've all been very helpful. Today I finally had the time to put a new power supply in and it fired right up. Woohoo! Thanks again everyone.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 624 Answers

SOURCE: System will not power up

Here is a Compaq document will walk you thorough a fairly lengthy procedure that should solve your problem. Here is the link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431080&query=presario%20sr1220&dest_page=product#N561 Let us know how this turns out or if you need any additional assistance.

Posted on Jan 02, 2007

SDZAKKMF
  • 50 Answers

SOURCE: No Power of a Compaq Presario Computer

Make sure that the power button is conected to the right prongs on the mother board. On the writing next to the prongs it should say power.

Posted on Feb 24, 2008

  • 108 Answers

SOURCE: Won't power up!

I would say yes, the power supply needs to be replaced. It is a cheap and easy fix.

One thing to check would be the capasitors around the CPU. If any are corroded or bulging then the motherboard will need to be replaced.

G'luck

Posted on Nov 11, 2008

  • 1 Answer

SOURCE: Flashing Green Light on Power BESTEC Power Supply

This is an easy fix so here you go nice and simple:

Problem: Your motherboard circuit has been cut.

Causes: Power disconnected during operation. Power outage or short in the surge protector.

Symptoms: Flashing green light on both motherboard and power supply. System will not power on.

Solution:

Step 1: Ensure that both the power supply and the motherboard lights are flashing green, not solid or off.
Step 2: While the power is on, disconnect the power supply from the motherboard. This connection is the largest of the connections and should be listed as the 'P1' or 'Primary' power connection.

Step 3: Wait until the green light on the motherboard stops flashing and check to ensure that the green light on the power supply is now solid. If it is not solid, disconnect the power to the power supply and wait until the light turns off completely. Then reconnect, it should be solid now.

Step 4: While the power is on, reconnect the P1 connection to the motherboard and you should now see that the light on the motherboard is solid.

Step 5: Power on your PC. The problem should not persist.

Warnings: If the power supply light remains flashing after you have restored power to it while it is disconnected from the motherboard, it may be a system failure in the power supply itself requiring replacement. Always be careful when working with an active or live power machine.

I hope this helped! Good luck!

Posted on Mar 01, 2009

  • 453 Answers

SOURCE: Bestec ATX-250-12Z when power lead plugged into

Hi;
you should check the capacitor in the secondry side of the power supply,

Posted on Oct 30, 2010

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How to troubleshoot Bestec ATX-1956D Power supply to determine if it is the power supply or another computer component..computer will not power up green light on power supply goes dim but does not flash...


The power supply is very inexpensive and can most likely be bought from any of your computer retailers, Amazon - Just make sure to confirm the right model type of power supply. BEST to have it tested before replacing it. To make sure that is the issue.. Many computer shops will test for free.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/william_02fc2766c1e13b73

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It won't turn on and the light on the back is flashing?


Sounds like a power supply problem. Check out this web site: http://www.atxpowersupplies.com/300-watt-power-supply-bestec-atx-300-12ed.php

This link should take you to your model of Compaq computer power supply.

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Compaq sr1350nx Well, just installed a new motherboard and replaced all the parts correctly as they were. Checked all connections fired it up and actually got a screen with a few numbers then a blinking...


It IS the Power Supply cjshearer11.

The green LED light flashing is a diagnostic light now. The diagnosis is a bad Power Supply with a Gree LED flashing.

Secondly, notice how the accessories are unplugged, and the Green LED light is solid Green?

1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts. Depends on what Processor it is.

Compaq Presario SR1350NX?
Uses an Intel Pentium 4, Model 519 (LGA 775 processor socket)

3.06GigaHertz maximum frequency rate (3.06GHz 'speed')
533MegaHertz Front Side Bus. (533MHz FSB)
1MegaByte of L2 cache. (1MB L2 cache)
Can use up to 89 Watts,

http://en.wikipedia.org/wiki/List_of_Intel_Pentium_4_microprocessors#Prescott_.2890.C2.A0nm.29

You press the Power On button. Inside the plastic Power On button is a Power On switch.

(Typical ATX power on switch,

http://www.directron.com/atxswitch.html )

The Power On button presses against the Power On switch making a momentary contact.
(The Power On switch is a Momentary Contact Switch)

This closes a circuit temporarily that has 5 volts present. The 5 Volt Standby power.
(The 5 volts is always present when the Power Supply is plugged into power)

The 5 Volts is directed towards a circuit within the Power Supply.
The Soft Power On circuit. (PS_ON)

This in turn 'excites' the Power Supply, and turns the Power Supply on.
(No pun intended)

The first chip on the motherboard to receive power is the BIOS chip.
(Chip and Chipset are slang terms for I.C.
Integrated Circuit)

Burned into the BIOS chip is a small program. The BIOS program.
The BIOS program looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.
(Windows XP, and Windows Vista are two examples of an O/S)

Your Power Supply has a weak voltage power rail.
(There are three main power rails in the SMPS in your Presario computer's Power Supply.
{Switched-Mode Power Supply}
The 3.3 Volt power rail, the 5 volt power rail, and the 12 volt power rail)

Enough power to light LED lights, and maybe spin fans, (Or spin a few times, and stop), but Not enough power to turn the Processor on.
NO Processor operating, no finding the boot record of the Operating System, on the Harddrive.

Do you have a KNOWN to be good, compatible power supply in an unused desktop computer, to use for a test unit?
Someone you may know may have upgraded to a better computer, and have a working computer with a Power Supply that you could borrow.

Needs to be an ATX form factor Power Supply.
Form factor for a Power Supply refers to the size, and shape of the case, for one.
It also applies to the power cables coming out of the power supply.

The size and shape of the case is;
6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.

Needs a,
A) 24-pin ATX main power cable,
B) 4-pin ATX +12 Volt power cable,
C) Enough standard 4-pin Peripheral power cables, for the optical drive/s (CD/DVD drive/s),
D) One SATA power cable

A) 24-pin ATX main power cable:

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

B) 4-pin ATX +12 Volt power cable: (Power for the Processor)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

C) SATA power cable: (Power for the SATA Harddrive. 15-pin cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#sata

D) Standard 4-pin Peripheral power cable:

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

The ATX power supply inside that Presario, is probably rated at a maximum Wattage of 250 to 300 Watts.
Made by some generic Power Supply manufacturer.
Bestec, HiPro, or Delta.
Around 90 percent of the desktop PC's out there use an ATX Power Supply.
You can buy one with as much Wattage as you want, won't hurt the computer.
A computer ONLY uses the power it needs, and No more.

Regards,
joecoolvette

Oct 20, 2010 | HP Compaq Presario SR1350NX (PP196AA#ABA)...

1 Answer

My power supply is blinking green light and my PC has no power


plug your pc directly to your wall outlet and see if it turns on. If it works, then the problem is your power supply. If power supply has a reset button, press it and try again. If pc does not turn on when plugged to wall outlet, then power supply for pc may be out.

Feb 16, 2010 | HP ATX-300-12Z, ATX-300-12Z Rev. CDR, HP...

2 Answers

Power supply or motherboard problem?


Hi talissap,

The blinking light is telling you something about the PSU. First check any AC mains voltage select switches for proper setting. US should be 115. Second if you have a multimeter, you could test the PSU for voltage. Disconnect all power to all components. remove all components from the board including cpu, memory . Leave the PSU only plugged into the board. Press power. If the fan turns on then it's not the power supply. The brand power supply isn't the best, I've seen where you need to wait for 5-20 minutes for the blinking to stop, at which time it will fire up. Now, if it doesn't power up, then it's most likely the PSU.

Good Luck,

Mark

Dec 08, 2009 | Bestec (ATX-250-12E) 250-Watt Power Supply

1 Answer

Bestec ATX-250-12Z Rev.C Green LD starts to blink


Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacement from Amazon.com, newegg.com.. Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

If you need further help, I’m available over the phone at https://www.6ya.com/expert/william_02fc2766c1e13b73

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PC won't power on. Compaq SR5410F


IF you have another power supply you can use, try it and see if the computer will power up.

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Compaq dead after power company shutdown period


Sounds like a blown fuse in the psu, replace the unit and you should be good to go.

Nov 30, 2008 | HP ATX-250-12Z, ATX-250-12Z Rev. H1, HP...

1 Answer

System will not power up


Here is a Compaq document will walk you thorough a fairly lengthy procedure that should solve your problem. Here is the link: http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph06788&lc=en&cc=us&dlc=en&product=431080&query=presario%20sr1220&dest_page=product#N561 Let us know how this turns out or if you need any additional assistance.

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