Have you tried to turn it on directly through the power switch pin terminal from the motherboard?

I think your drive is going to fail. Try to do a clean install and check if you can do it successfully. If not, replace your hard drive.

Reseat your ram sticks or run your computer with a single stick, check what will happen. Also try it in different slots.

Try this first:

Unplug the AC adapter from your computer.

Remove the main battery.

Remove the memory sticks in their slots and clean their gold contact with a pencil eraser.

Keep...

Your system might be infected with viruses or malwares. Since you won't be able to run any executable files. I advise you to update your antivirus definition lists and to scan your system.

If you...

Remove your ram stick and pull the cmos battery out on the motherboard for about 10 mins. Put everything back in again.

Have you tried to set your bios in default settings?

If you use a single memory stick in your system , what will happen? Use one stick at a time and try to test it also in different slots.

With one memory stick installed, what will happen? Use one stick at a time and try to test it also in different slots.

If those two sticks installed in your computer came with the original factory setup and they were successfully working together previously. I think what you need to do is set the bios again in...

Perform xp repair install.

Have you tried to work with your memory modules? Try that too.

Unplug the AC adapter from your computer.

Remove the main battery.

Remove the memory sticks in their slots and clean their gold contact with a pencil eraser.

Keep pressing the power button...

It's a memory issue.

Clean the gold contact of the sticks and reseat them several times in their slots.

Or the last memory upgrade might not be compatible with your system.

Okay reset the bios in default values then start your computer.

If it doesn't work, it's time to work with your hard drive.

Try to pull your hard drive out in its bay and put it back again...

Check the output voltage of your power adapter or try it with another power adapter. Sometimes the problem was caused by a faulty or shorted power adapter.

Do your drives detect in the bios? Did you flash your bios before?

Maybe your computer was attacked by malwares or trojans or viruses. What you'll need to do is install a firewall aside from your antivirus program to prevent or to protect your system from any...

Download and execute to get rid of the issue:

http://www.techsupportforum.com/sectools/sUBs/Flash_Disinfector.exe

Reinstall or repair your operating system. Check if this helps.

We were not sure if the card installed by a technician was also compatible with your computer unless you bought it in a memory card manufacturer (Crucial site).

The last resort I can see is clean...

It refers to your base memory, either the ram stick or your dimm slot is malfunctioning. Try to put your memory module in into another slot then boot up your computer. If it still doesn't work, try...

Maybe it's a hard disk or software (OS) problem. Try to reinstall or repair your operating system.

See to it that your dvd/cdroms are recognized by the bios. Have you checked the jumper settings of your cdroms? Try to check in the bios if the ide controllers (primary and secondary controllers) are...

I think it was a hardware problem. Make sure the bios detects the hard drive.

hmmm if you feel that it was not the case the problem now lies on the memory controller of the motherboard. Replace your board or let your system run in single channel mode.

Maybe your motherboard does not support dual channel with two identical ram sticks which have more than 1.8 ram voltage. So it beeps when the two dimm slots are filled with sticks with unsupported...

Open AVG program.

Go to the Control Center.

Double Click on the Update Manager or select it then click the Properties button.

Untick the option "Do not ask for the update source", click...

you will have to reinstall them again (antivirus, firewall, etc..). With regard to windows update, try to update again from the microsoft site. Problem persists, do a clean xp install.

I think you will need to set your bios in default values then reboot. Set your settings again that you have before (if any). Next put your winxp cd then key the Ctrl-Alt-Del to restart your computer....

How to take ownership of a folder. Try this one:

http://support.microsoft.com/default.aspx?scid=kb;en-us;308421&Product=winxp

Maybe your 20 pin power connector on the motherboard or from the power supply is loose or not properly connected to each other. Try to push all the wires towards to the motherboard socket.

If it...

It might be your power supply. A burnt power supply may also damage your motherboard. I hope not..

Does your computer detect the card own bios? The card bios will post or appear on the screen upon starting. You will need a floppy disk drive to install a card driver.

Before anything else, try to repair your operating system. Remember, back up all your files. Sometimes it might be a software problem. Be ready to have some program cds that needs to be reinstalled...

Try connecting it first in your computer. Set your new ide hdd as master in the primary controller and temporarily remove your sata drive then boot your system just to see if the bios detect your ide...

Since your computer kept restarting, sometimes it was a software problem. Why don't you try to start from scratch again. Do a clean install. If you are still unable to do a clean install on the hard...

Be sure the ide hard disk drive is spinning. If not, try powering it up with different power connectors.

Check the ide hdd into another computer.

I am not 100% sure if you can retrieve your files in your hard disk by connecting it as slave to another computer. Try it.

Clear the cmos through the pin jumpers or battery. Boot your system.