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...

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...

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.

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...

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..

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...

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...

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.

Try it first, clear the cmos. Pull the cmos battery out for few minutes then put it back again to its battery holder. Boot your system. See if it will help.

Test it out of the case and run it with...

Run it with one ram stick installed in your system. Check what will happen.

Remove your video card and run the onboard video in your system.

I think your motherboard is about to fail. To confirm this, test all essential components in another computer.

Put the original processor fan and its heatsink back again and double check the internal connections especially from the front case to the motherboard (power button switch, etc.). Remove memory...

Run scandisk or check disk in winxp (check all check boxes in the "Check disk options" field) and defragment your hard disk.

It's time to clean the processor fan and the heatsink. Like what I said the problem might also be your ddr ram. Try to clean the gold contact of a memory stick with a pencil eraser before inserting...

The case switch is sensitive. What do you mean?

I have used my compaq desktop with the original power supply for 7 years without any problems. Anyway, use a new power supply in your system and reserve the old one for future use.

Double check your internal connections especially from the front bezel to the motherboard.

If I were you, I will start and test the computer through the power pins of the motherboard.

Insert a known good memory stick in different slots. It might help you find the culprit.

Remove and install again the memory sticks.

Set the bios in default values. Start your computer.

Try to reseat your memory sticks and test your system with one stick at a time in different slots.

okay, firstly, try to reseat your memory sticks. Start your computer.

If the problem still persists, you will need to reset the cmos.

Remove the main battery.
Remove the bottom cover.
Find...

So, it was a power issue.

Check your AC power adapter voltage output. Maybe the power adapter is bad and doesn’t provide enough power to boot up the laptop.

Remove the power cord and the...