Constant Restarts

[Phlegatu]

I have a problem I'd really appreciate some help on. I'm having constant restarts, where my system will randomly reset itself with no apparent cause. It happens maybe once a day - sometimes, especially lately, it happens more often. Usually it happens while I'm doing something, but it can also happen when I leave my comp on overnight or during the day when I'm at work - I'll sometimes find that it's in the XP login screen when I get back to it, though this is relatively infrequent.

I reformatted my computer a while back for unrelated reasons (I posted about it on these forums earlier this week). I figured if the problem was software-related it would go away after that, but it hasn't. It's really annoying, and I want to get rid of it, and I think it may even be happening more often than it used to before the reformat.

I know it could probably be one of a thousand things, but I really need help narrowing it down before I can hope to fix it. Are there any diagnostic tools or whatever that can monitor my system up the the point where it restarts and provide clues as to what could cause it? Here's a few bits of information that might narrow it down just a little (or not):

- the machine doesn't warn me about overheated processors or anything when it reboots (I mention this because when my CPU fan was breaking down it would freeze or reset the system and then it would give me a temperature error on startup, and I know it isn't that this time)
- when it resets, Windows XP doesn't mention any problems, or offer Safe Mode or anything like that
- the machine seems otherwise in good working condition, with no viruses, spyware, and is defragged regularly, not even that many programs installed on it, big enough page file, etc

As I said I would really appreciate any help of any kind. Here is some info on my comp. If you need more info, please say so and I will be glad to provide.

AMD Athlon 2100+ processor
512MB ram
ATI Radeon 9600 128MB
Asus A7V333 mobo
Windows XP Home
3 Western Digital HDs, 200GB (WinNT), 80GB and 200GB, all NTFS

Have a good day.

[TechZ]

- the machine doesn't warn me about overheated processors or anything when it reboots (I mention this because when my CPU fan was breaking down it would freeze or reset the system and then it would give me a temperature error on startup, and I know it isn't that this time)

1] So have you replaced the fan since? And if u have has this restart problem started since?

2] Heatsinks collect dust and sometimes that could be it.

3] Check whether all the fans in the case, on the vga card, cpu, etc, are working.