20 Most Recent HP Pavilion a815n (PS512AA) PC Desktop Questions & Answers

it's not locksum ,its Check SUM or CRC errors. what OP, are you running,? windows what. i guess. the CMOS battery just died. install a new one. all puters this old do that, the battery is good for 7-10 years, and all fail. DO NOT FLASH your BIOS, fix the real problem first when the battery dies, all our bios setting were lost including boot device, and order fix battery then go into BIOS and put back boot order.

When you run the make recovery/restore disks software it will tell you. Look for a folder called HP in your program files list (click start) and you should see the recovery options somewhere in there. I'd guess, not including DATA 12+ cd's or 2 dvd's.

If you press the power button and nothing comes on you may have a bad power supply and need to replace it.

i can only suggest that you get the dvd drive in the computer replaced as it would appear the problem is a fault with that drive, however try the dvd in another computer and see if it has the same problem because if it does then the problem is with the dvd not the drive hope this helps

Hi James,Your best bet will be to visit the Asus website and click on the 'support' tab at the top of the screen. Select the link for 'drivers' and specify your motherboard model. It's possible that there will be a BIOS update for your Asus m/board.If so, do a BIOS flash and check if your PC will then accept your new CPU. NB! Take care when flashing the BIOS. Make sure there are no power interruptions etc. while performing this procedure as this could corrupt your BIOS software and render your motherboard useless.Feel free to message me should you need more details or further assistance.Best wishes,Graemevm

There could be 3 reasons for it. 1 The sound driver is not loaded/activated. You may have to load it again. 2 The volume switch is on MUTE. Check on this by clicking the speaker icon on the task bar. 3 The volume switch is placed on the bottom low position.
For my information were you getting sound earlier????????

Yes you can,

http://www.cputopia.com/hp-480w-hp-pavilion-a815n.html

$19.99USD

Have a nice day

The motherboard battery is the CMOS battery that has a part number of CR2032 and can be acquired at your local Walmart or Target type store. You will need to remove the side panel of the computer to get to the motherboard and just look for a round battery should be silver looking. Remove it and replace it with the one you purchased if it needs replacement that is.

In the abscence of more details, try the following:

Firstly, did you get any beeps as the system powered on? If so, how many and what sequence?
If you get One beep, all is well. any other beeps,means problems

Secondly: Try connecting the computer to another monitor, see if you get a screen there. If you do, the issue is with the monitor, if not, the issue is with the tower.
Thirdly: Check the video is woking by EITHER changing the video card or plugging the monitor into the onboard video port
Fourthly: Is the CPU fan spinning? Is the Heatsink on the CPU getting warm? If after 5 minutes or so it is not, you could have a failed CPU
Fifthly, Check the motherboard for any bulging or blowing capacitors (the small cylinders on the board), they may be leaking, with a brown/ yellow paste
Sixth: Unplug all drives/ usb connectors/ audio connectors, remoce the CMOS battery replace the battery and reboot. See if this helps. If you get a signal, replace each in turn and see if one component is causing the problem, also try removing each memory module in turn and replace it

If those solutions do not work, and this is the "sunshine" motherboard, the board has probably died.

You are absolutely correct with your diagnoses.

Bad Power Supply. Weak voltage power rail.

The power outage may, or may not have caused the Power Supply to fail, it may have just aggravated the situation. The Power Supply may have been close to failing.

Supporting data:

1) A bad Power Supply is one of the leading causes of computer failure. Close to 80 percent. Quite common.
2) Coming in at number 2 is the computer is dirty inside, as well as the Power Supply.

A Power Supply for today's PC computers is an SMPS.
Switched-Mode Power Supply,

http://en.wikipedia.org/wiki/Switched-mode_power_supply

Click on the photo to the upper right.
(You can click on the photo again to enlarge. You can enlarge twice)

The cooling components for an SMPS are it's internal Fan, and Heatsinks used inside.

Typical construction of a Heatsink is a plate of metal with tall, thin fins protruding from it.
The plate of metal absorbs heat from whatever object it is placed against, and the tall, thin fins absorb heat from the plate.

The fins radiate the heat away. (Much like an automobile radiator, and steam radiators used in homes/businesses)

The fan pushes air in-between the fins, and around the fins, and helps to carry the heat away.

(There are two Heatsinks shown in the photo's example.

They are in-between B and C, and C and D.
The Heatsink's resemble aluminum 'Lincoln Logs')


When the cooling components for the SMPS become clogged with 'Gunk', the cooling capacity drops tremendously.
(Gunk = Dirt, dust, etc)

The Power Supply overheats.
Heat = Wasted Energy

The Power Supply strains to keep up with the call for power, but eventually cannot, and fails.
(Components inside the power supply fail)

I believe with your scenario the Power Supply is dirty inside, and was on the verge of failing soon.
The power outage caused a voltage spike, and aggravated the situation causing the Power Supply to fail.

Depends on what country you are in, but if you are in a country that uses 120 Volts AC, (USA), the utility company is allowed to provide 108 to 127 Volts.

Country using 220 Volts AC?
208 to 227 Volts.
When the power went off, there could have been a voltage spike that exceeded way beyond the maximum allowed.
No, unfortunately a utility company cannot be held responsible. :(

Solution?
Replace the Power Supply.

1) HP Support > Pavilion a815n desktop computer > Main support page,

http://h10025.www1.hp.com/ewfrf/wc/product?product=445595&lc=en&cc=us&dlc=en&submit.y=5&submit.x=6&lang=en&cc=us

Click on Product information > Product specifications > Motherboard Specifications, PTGD1-LA (Goldfish)

Scroll down towards the bottom of the page to view the motherboard illustration and photo.


Power Supply power cable requirements and added info on the power cable connectors:

A) Looking at the motherboard illustration view the right side. Find the > ATX Power Connector
Match it to the area on the motherboard photo.
White connector with 24 socket holes. Two columns of 12 holes.

You need a Power Supply with a 24-pin ATX main power cable,

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

There is a Lock on the side of the connector (Male) with the wires coming into.
There is a Lock tab on the side of the connector (Female) on the motherboard.

The Top of the Lock on the male connector is squeezed in.
The Lock works on the same principle as a See-Saw on a playground.

Squeezing the top of the Lock IN, brings the Lock's tang away from the Lock Tab on the motherboard connector.
Then the Male connector can gently be wiggled, and removed from the Female motherboard connector.
(Caution! Do Not pull on the wires. Pull Only on the connector)

This also applies to the connector below.


B) View the motherboard illustration to the Left side.
To the left of the large square block with > Intel i915 GCMH is a smaller square with > ATX12V

Match this to the motherboard photo.
It is a white square connector with 4 socket holes, to the bottom left of the Processor socket.

You need a 4-pin ATX +12 Volt power cable,

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


C) The Power Supply will also need a SATA power cable for the SATA harddrive,

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

IF, the SATA harddrive has connectors for a SATA power cable, AND a 4-pin Standard Peripheral power cable, ONLY USE THE SATA power cable.

If you use both you will burn up the SATA harddrive. Sometimes not all at once, but down the road it will.

D) The Power Supply will also need enough 4-pin Standard Peripheral power cables, for the optical drive/s, (CD/DVD drive), and any computer case fans which require this type of power cable.

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

(NOTE*
In the photos an IDE (PATA) harddrive is shown. Your harddrive is a SATA unit. Does NOT require this power cable)

The power cables shown as standard for Power Supply's being sold today.
I wanted to show you what they looked like, and information on the connectors.

If you go back to the Main support page, click on Manuals, then in the list click on > Part Replacement Instructions, you will have a pictorial guide in opening the computer case, and how to replace the Power Supply.

It is a PDF file. Allow up to at least 30 seconds before you see the first page. It may take additional time for the file to fully download.

(Took 2 seconds to see the first page. The first page is blank. Took an additional 47 seconds to fully download. Using a medium speed DSL connection)

Replacing the Power Supply, and opening the computer case - Page 31.
(I would suggest reducing the view to 100 percent. Click on the Zoom Out icon at the top of the PDF file.
{ - }

If you have additional questions regarding the above, or need guidance in choosing a decent, affordable Power Supply, please post in a Comment.

Apologize for the length of this solution, but I feel it's better than stating, "Replace the Power Supply"

Regards,
joecoolvette

Try HP Support & Drivers.

You can replace it bro and use front panel power wire switch.

Hi, yes you can but you have to follow the instruction on the HP website on how to do that. Visit the link below to learn how to do that..
https://h10025.www1.hp.com/ewfrf/wc/document?docname=buh06273&lc=en&dlc=en&cc=uk&product=445595&lang=en
Take care

The most likely cause would be the hard drive. The first thing I would do is run the defragmentation utility that comes with Windows (usually under start->programs->accessories->system tools-disk defragmentor or some slight variation depending on your version of Windows). It could also be you're running out of free disk space or your disk is failing. In either case replacing your drive would be the best next step. It is a very simple series of steps to "clone" your drive to a new drive (the cheapest hard drives being around $50 or so). You can pay a professional shop or promise your favorite geek mountain due and pizza in exchange (that's the stereotypical geek bribe anyway). It shouldn't take more than an hour to do.

Of course a complete re-install of Windows always does wonders but if it really takes [half hour|hours|more] to boot replacing the whole drive would be the best solution.

if u have got geniune windows vista or 7.there is option of making recovery disk on ur desktop.go to start menu and search for recovery.u will get utility to make recovery dvd.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To resolve this behavior, follow these steps: 
Start Registry Editor (Regedt32.exe).
Locate the UpperFilters value under the following key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

On the Edit menu, click Delete, and then click OK.
Locate the LowerFilters value under the same key in the registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}

On the Edit menu, click Delete, and then click OK.
Quit Registry Editor.NOTE: After you remove the Upperfilters value and the Lowerfilters value, if you notice lost functionality in a particular program, such as CD recording software, you may need to reinstall that software. If the problem recurs, consult with the software vendor for assistance. 


Restart your computer.

These are the spec of memory you can use .
If it does work by itself it might be defective of not compatible with yous system.

Thank you

Memory Installed 512 MB (2 x 256) Maximum allowed 4.0 GB* (4 X 1 GB) requires the replacement of the installed 256 MB DIMMs

*Actual available memory may be less Speed supported PC3200 MB/sec Type 184 pin, DDR SDRAM DIMM slots Four Open DIMM slots Two

My first guess is to replace the power supply. These are fairly cheap and easy to replace. Unplug your computer. Just open the side of the computer (often the left facing you). The power supply is on the top which is plugged in. Remove the plug and locate 2 - 4 screws that hold it in place. Disconnect the main from the motherboard (remember where this goes for later). Install the new one and reconnect power. This is the most likely reason. If that fails, the motherboard may be dead. The green light flashing indicates that the internet is ready but has no power.

click on start then go to setting then control panel in control panel go to sound and audio devices i n that you will see volume tab in volume ther is option called place volume icon in the task bar just select taht and apply it it will show spk icon on your task bar but be sure that your sound card is properly installed. pls get me back if you need further assistence. bye