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PC restarts after few minutes and restarts continuously

Hi,
My systems configuration is-
Pentium 4 2.8E
Intel original 865GBF
1536MB DDR Ram
80 GB IDE HDD
Windows XP professional
......

The problem started few weeks ago. The pc starts fine and works fine. But after 30-40 minutes Windows suddenly shuts down in proper way (showing shutting down screen, windows restarts screen) but automatically and then starts restarting just after entering in BIOS. It restarts continuously.

I took my PC to the repair centre and they found several damaged capacitors on motherboard and repaired those. But the problem is still there and they couldn't identify the problem.

Now what is the problem? Any advice? How will I solve this problem?

Thanks in advance.

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That issue is well known.

In reply to: PC restarts after few minutes and restarts continuously

Type BAD CAPS at google but be aware that while replacing the caps works, sometimes it doesn't and you have to replace the mainboard.

However there is a clue here and if this was my machine I'd get some heatsink compound then remove the CPU heatsink, put a drop in the center of the cpu and put the heatsink back on. I'd leave the cover off and see if the cpu and other fans work.

Now ask if there was any improvement. If not, shop for a new mainboard and possibly a new bigger PSU since those failed caps can stress the PSU.
Bob

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Why shutdown normally?

In reply to: That issue is well known.

Hi,
Thanks a lot for your advice.

All the bad capacitors are already changed. But the problem is there. I will definitely try some heatsink paste on processor as you advised. But I don't understand how it can shutdown normally before it starts restarting again and again. Is there any explanation?

Another information I should share- when I enter into the BIOS and keep the machine running then it runs properly as long as I wish to run it. But it starts making problem when I boot to windows and then run for a while.

As mohamed_e56 was saying it is because of some kind of virus. But I couldn't find any virus using AVG antivirus. Can you name some specific virus so that I can try specific tools for those?

Also I installed windows XP in another drive and same problem exists there.

Any advise on this?

Thanks a lot for your help.

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" Is there any explanation?"

In reply to: Why shutdown normally?

Yes, but the cost of the forensics and postmortem usually means that we never find out exactly what Microsoft's code is doing or why some CPU code fails when hot in some way. Since this is what it is I never am paid to do root cause analysis but just have to fix it. All I can do is give you the benefit of what helps most often for a dollar.

As to the virus, I didn't think it was that so you'll have to seek why they wrote that and what they would do about it.
Bob

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there are 2 reasons for that

In reply to: PC restarts after few minutes and restarts continuously

the first reason is it a virus because only virus will close the windows normaly or it is a windows damge or some thing in oyur mother boared cause that but if so it will studenly restart so scan for virus and update your anti-virus and i am sure u have more than one ram so open the computer with one ram if the problem still exist install new windows and thank you

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RAW, virus, losing system files

In reply to: PC restarts after few minutes and restarts continuously

There may be many reasons, for example, low power supply, virus, losing system files. You may try like this:
1. Connect this drive to another healthy computer and check whether there is virus.
2. Use system installation CD to repair your OS.
If these steps failed, there must be some hardware problem, like the RAW.

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