Question about HP Media Center m7250n (ED842AA) PC Desktop
My computer is HP Media Center m7250. Today, we experienced power outage. After that, I can not power up the computer. There is a green light on the power module, which is flashing. Then I pulled the power plug off. the green light still flashing, but the flashing slows down and finally dim. When I plug power back, the green light flashing again at a constant pace. Does anyone experience the same problem and know a solution.
BTW, HP costomer support said they can boot my computer remotely if I pay $99 for extended warranty.
During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.
POWER SUPPLIES HAVE AN INDICATOR LIGHT FOR A REASON.
REMBER - BLINKING LIGHT IS AN OVERLOAD OF THE PROTECTORS AND ELLIMINATING THE OVERLOAD SOLVES THE PROBLEM AND THAT THE POWER SUPPLY IS WORKING AND CONVERTING POWER.
NO LIGHT MEANS NO POWER OUTPUT AND THAT INDICATES THE POWER SUPPLY IS NOT FUNCTIONING AND NEEDS REPLACED.
Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.
Posted on Mar 28, 2010
Pull the plug out and leave it for 1/2 an hour. Most modern power supplies have an overvoltage protector that will trip and only reset if they are unplugged for a while.
Failing that, there is a more detailed set uf steps here: http://tinyurl.com/25efla
Best of luck.
Posted on Jan 13, 2008
Thanks for the post on connecting the mother board power connector. I have an HP Pavilian a1120n desktop and had the green flashing light after a power fail / restore. HP Trouble shooting steps told me the Mother Board was but, but not the case.
I was ready to give up on my PC and followed the risky move of attaching the mother board power supply without unplugging the external power cord. It came back to life and seems to work fine now. Not sure why, but somehow this caused a little shock or reset that got the system running again. All seems good.
Posted on Jun 09, 2008
I had the same problem with the green light flashing.
During the process of moving my CPU from one room to another I unplugged the computer w/o turning it off first. (whoops!) when I plugged it back in I got the notorious flashing green light and nothing else!
I tried plugging in the motherboard with the power plug in. It worked like a champ. Specifically… I unplugged the computer and let the flashing green light slowly die. Then I unplugged the 10x2 pin wire harness power connection from the motherboard. They I plugged the power cord into the wall, then plugged the 10x2 harness back into the motherboard. The computer, fan, etc… came right back on.
The computer didn’t recognize and of my peripherals other than the monitor so once it was booted up I had to force power off and power back on. Now it works fine.
Thanks everyone, you guys are AWESOME!
Posted on Jul 23, 2008
I had the same problem with green flashing light on the power supply, I unplugged the power supply from back of computer, than unplugged mother board power supply pin, plugged the main power in on back again and waited for a couple minutes ( this was important, when I didn't wait, it did not work) than I plugged in the mother board power supply pin again and it started. No more flashing light. Yeah!
Posted on Nov 05, 2009
Had the same problem with a Presario S6000NX. First, let me say that disconnecting and especially connecting a live power supply is the second dumbest solution to a problem like this that I ever heard of. But I was desparate and tried it. It didn't work.
However, the absolute dumbest solution I ever heard of, which I read on another thread, is using a blow dryer to warm up the power supply. Well, it worked.
Posted on Feb 20, 2010
My 2003 hp pavilion a350y just had the same issue - no power and green light flashing on the back after it was unplugged for a vacation week. As suggested here, I opened the case and unplugged/replugged the power supply (white with a bunch of different colored wires attached) from/into the mother board and power came on immediately. The green light is now on but not flashing. I have turned the computer on and off a few times and it still powers up. I am still not sure of the cause, maybe previous power surges have damaged something? I am hoping for continued success. HP tech support wouldn't even talk to me on the phone as my computer is too old. This site, viewed easily on my small cell phone screen, and the same solutions previously posted, saved me. Thanks so much everyone for the help!
Posted on Oct 04, 2009
I am having the same problem with a HP Pavilion a 744x. I tried disconnecting the motherboard and the "hair dryer thing" and neither worked for me. Does that mean my power supply is bad? When I unplug the motherboard and plug power back on the light stays green. But as soon as I plug the motherboard back in, the light flashes green. Help!!!
Posted on Feb 01, 2011
My computer is a HP MEDIA CENTER M1160n and I just did the unplug of power to the motherboard and got a solid green light and when I repluged the power to the mother board, while the main power cord was still pluged in, the problems was solved just like other have posted solving other models of HP Media Center computers with this problems. Thanks to everyone for comfirming this solution.
Posted on Nov 10, 2008
This is to confirm that the Hot Swap, or hot-plug-in-the-motherboard solution works for the HP Media Center m1050y as well. I recently had my electrical service interrupted, and when it was re-connected, the computer failed to boot. The only signal was the flashing green light on the power supply. I followed the HP procedures, systematically disconnected every single device, and concluded that my motherboard was fried. You have no idea how happy I was when I found this thread, and ran the hot swap procedure.
One could argue that it is not safe to put your hands in the constrained space, and invariably brush fingers and palms on exposed electical circuits, while forcing that huge plug back into the motherboard while the power supply is activated. My conclusion is that the low voltages make for a low risk. THANKS !!!
Posted on Oct 21, 2008
Hi i have been having problems with my pc for the last few weeks, at first it wouldnt go into windows and had 4 black lines running down the screen and then a space and more black lines and so on. then i finally do disk recovery, worked well for abf out aweek then i started getting a black box of black lines running through my mouse pointer then would freeze, and now the screen just flashes like a neon sign it looks like a vegas sign running down the screen like its moving. can someone plz help
Posted on May 15, 2008
Just had the same problem about the green light flashing, solved it by opening the case, without unplugging the power, disconnected the motherboard wires, and then reconnected them, now the green light is steady. Hope this helps! I know it;s a little dangerous to open the case with power on, but this was the only way to remove the charge in the motherboard that kept the green light flashing
Posted on Sep 26, 2009
Same problem with a Pavillion a844n. I had to go one step further. With the power cable to the motherboard disconnected, and the power cord plugged in and power to the computer, I held the on-off switch depressed and plugged in the motherboard power supply. It's alive and everything works.
Posted on Jul 14, 2009
This is Hatehp here again. Glad to see the risky way work for many users.
Recently, my computer experienced power outage again. Then, the same green light flash and unbootable problem happened. With the same risky way (Hot Swap may be better to describe the approach.), my computer is alive again. But, this time I have tried a few of times before I succeeded. There may be some 'waiting period' or certain sequence of steps required. Anyway, it works.
Recommendation: To prevent this happen again, in BIOS, set Power Up option to Off (or Manual On) after power outage, instead of Auto. I think at least this setup has no hurt.
Some posts suggested that the problem may be caused by lacking of power. They have successful stories too with more powerful power supply. I am not sure it is the root cause. But stronger power supply has no hurt either. Truly, I hope it is the real solution, so I can avoid the risky way.
Thanks for reading the message.
Posted on Sep 19, 2008
I have a usb mouse and it's working properly in windows, but if i play a Cue Club game the mouse cursor speed is being too slow. Plz give me the solution of this problem
Posted on Mar 13, 2008
Eric johnson : after a power outage the pc will not start up The green light is flashing on the back
[An agent will be with you shortly.]
[You are now chatting with John .]
John : Welcome to HP Total Care for desktop support. My name is John. Please give me few minutes while I review your issue description.
NOTE: For security reasons, PLEASE DO NOT send credit card information via chat.
John : After reviewing your issue I gather that your computer is not booting up, correct ?
eric johnson : yes John
eric johnson : have tried all the basics
John : The power supply light at the back is also flasing, correct ?
eric johnson : yes
John : Is that computer beside you so that we can try some troubleshooting steps ?
eric johnson : yes
John : First, may I please have the product and serial number of your system? This information will help me pull up the relevant details needed to troubleshoot the issue. Please check the side panel of the tower, you will find a bar coded silver sticker and on that sticker you will find a 10 character alphanumeric code starting with S/N for Serial Number & P/N for Product Number.
eric johnson : product key?
John : No
John : The product and serial number of your system only
eric johnson : SN MXM413OGWO
eric johnson : MXM4130GW0
John : Is that a HP Pavilion a518x Desktop PC ?
eric johnson : yes
John : First please turn off the computer and unplug the power cable.
eric johnson : done
John : Now please slide open the side panel of the tower carefully.
eric johnson : done
John : Now please open the ATX cable from the motherboard of your tower.
It is the largest cable that comes from the power supply and connects in the motherboard. It has a bunch of colorful wires in it (at least 24 wires)
Please unplug it from the motherboard
eric johnson : done
John : Now I will request you to turn on the computer with the ATX cable unplugged and let me know if still the power supply light at the back is flashing or solid green ?
eric johnson : done
eric johnson : flashing green
John : Can you please check and let me know , is the power supply fan spinning ?
eric johnson : no fan running
John : It means that the power supply gone bad and needs to be replaced.
eric johnson : shorted out by a power spike? possibly?
John : Yes. I think so. The sudden power outage caused your computer tu shut it down suddenly. Due to sudden shut down of the power, the power supply has got effected and possible some part of that power supply has gone bad.
John : Because if it was good, the power supply light should not be blinking. It should have been steady green.
eric johnson : if it was steady green what would the next step be?
John : If it was steady green then we should have gone ahead with the troubleshooting steps to check the motherboard is good or not. However, in this case it is clear that the power supply has gone bad.
eric johnson : ok so .. ill go get it serviced by the professionals
John : Yes. Unfortunately the power supply for your computer model is out of stock.
eric johnson : do you have the model #?
eric johnson : part number
John : I am sorry, as your computer is pretty old and as it is out of stock, our database is not giving the part number of the power supply as well.
John : However, if you want to go for a new computer I can certainly assist you in configuring a good computer for you. Because you can get a good computer with Windows 7 operating system in as low as $299.
John : Eric, I have checked the specification of your computer , the system whihc you have is very old is that correct ?
eric johnson : it is an older model yes
John : Let me inform you that the Hardwrae parts which you have in your computer is the Obsolete parts.
John : Even if you purchase and hardware parst from a local store you wil not get the origunal once
John : Eric, dont you wish to have window 7 as the operatig system
eric johnson : well..it was working fine until this happened
John : Correct < today or some other day you had to have the issue with yoru computer.
eric johnson : whats the going price for a fix any idea?
John : It will cost you around $350 for sure if tyou go for the original parts
John : Eric to be practical enoug today you will spend for the power supply , some other day you will have another issue then again you have to spend
eric johnson : ok thanks for the help.I cant afford a new desk top right now
John : That is fine. It was just for your information only.
eric johnson : thnaks again John good day
and then ........I used the hair drier Brilliant!
Posted on Mar 15, 2010
My friend thought he could stop a virus infection by pulling out the power cord on his HP A700N PC. When he gave it to me to exorcise the Virus the PC would not turn on. Only the green light on the power supply would blink. I read all the hints for this problem on the HP M7250n and the one that suggested removing the main power plug to the Mother Board with the 120-240 V power cable removed then plug the 120-240 V main power cable into the PC followed by the Mother Board power cable solved the problem. The PC turned on and the green light is steady.
Posted on Aug 17, 2009
Yes i had the same problem with the green flashing light and found it was the motherboard that was the problem. I did it Hatehp's way and everything works fine now so i dont have to replace my motherboard thanks to Hatehp!
Posted on Jan 29, 2011
Unplugging the computer from AC, opening it, unplugging the motherboard, then plugging the computer back into AC, and finally plugging the motherboard back in WORKED!! I just have to mention that in the 22 years I've had about 15 Macs of various kinds. I've never had a problem that required such a ridiculous solution. This is a PC I bought my dad (Compaq Presario SR5605F), it's about 2 years old. I'd never by such a piece of junk if I had to rely on it for myself.
Posted on Dec 03, 2010
Thank you SO SO much! I followed the troubleshooting guide, and found the motherboard was to blame too. I have a HP media center m1264n. The motherboard is located behind the media drive box, so I had to cut the drive box tie cable, then remove the motherboard connectors (it's the one with the TON and TON of wires coming from it.) Once I plugged the computer back in, I plugged in the mother board, and then the drive. All is well and right with the computer world!
Posted on Jul 31, 2010
Same problem as everyone else - power outage, flashing green light, computer won't turn on (HP Pavilion a700n). Opened case found power supply to motherboard (multicolored wires into a white adapter). To disconnect the white power cord adapter, there is a latch, use your thumb to push in on the top and wiggle. Here is a link to a video on how to do it.
(eHow.com, search "How to Remove a CPU and Motherboard")
There was no electrical shock, and I was able to turn on the computer. Initially the mouse was frozen, but I turned unplugged the computer from the wall, waited a minute, plugged it back in, and it runs well.
Posted on Mar 25, 2010
I want to kiss you on the mouth. :)
Thought I was going to have to buy new power supply. Wasn't even sure that was going to fix it.
Thanks so much!!!!!
Posted on Feb 02, 2010
I have a Hp pavillan a532x/ I had the same problem on the flashing light in the bcak of the cpu. I followed the instruction of opening the cpu and disconnecting the big motherboard. I just followed the rear of the adapter and then found this " Motherboard" It was white and had a lot of wire adapter on it. My CPU stopped blinking and became a solid green light. I was able to immediatllly start up my cpu.
Thank you all so much,
Posted on Jan 27, 2010
Nice! This worked on a HP pavilion 470a as well, it did take me unplugging everything giving it 5 minutes holding down the power button for a 10 count with no power. I plugged in the power first after that, reconnected the mother board with live power and it powered up like a champ!
Thanks everyone for your great help here.... made my day!
Posted on Sep 05, 2009
Thank You Hatehp jan 13,1980, by the way I love my HP, anyway I followed his advice and my HP is up and running "I opened the computer box. I was able to identify that disconnecting the power plug to the mother board will stop flashing and the green light is on. But without mother board, it is not a computer any more.
At one point, I pluged the mother board power plug back on without disconnecting the main power supply plug (the green light was steady.) Then the computer start boot up."
Posted on Jan 26, 2011
If after you've tried disconnecting all power and letting it sit long enough to reset... your power supply has suffered a voltage surge must be replaced. Power surges will toast your power supply. Replacing the power supply is inexpensive and not difficult... Google "replace power supply"... but basically just pay attention to all you disconnect... to reconnect... and then be sure to purchase quality surge protection.
Posted on Jun 15, 2009
Now tickle me pink! used the blow dryer and it work.
Posted on Jan 08, 2013
I have an hp and after power interruption the green light kept blinking. i tried the blow drier technique and it worked so that i am now able to post this message. great suggestion and thanks a million for posting it. i suggest that when you blow out the dust take the cpu outside or you will have a lot of dust flying in the room. good luck and lots of thanks.
Posted on Sep 17, 2012
Thanks to all you guys i got to work nagain
Posted on Mar 28, 2012
Thats temporary solution. what will happen if you want to sell that computer and when they try to turn on???? blinking light will blink again! Does anyone have a solution whichone will fix problem forever (dont need to replug PSU cable from mainboard to make computer to work)
Posted on Nov 15, 2011
I solved the same problem today ( August 5, 2011) by the method detailed by Hatehp on Jan 13, 2008. My computer is HP Pavilion a1220b. Thanks Guys for posting this reply. You are indeed helping so many people to save in this bad economy. SSam
Posted on Aug 05, 2011
I just did the unplug the power to the motherboard thing and it solved this problem. I can't believe it. I would have never thought of that. Thanks!
Posted on Jun 28, 2008
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Posted on Jan 02, 2017
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