Computer restarts for no reason

I would suspect the battery in the ups. They only last a few years. If you experiece a brown out, the UPS may try to switch to the battery, which if bad, will make your PC loose power completely. By bypassing the UPS, you pc is able to continue running during the brownouts, but that isn't exactly a good thing. You are loosing some valuable protection.

Next I would suspect the power supply.

As for the blue screen of death, I highly doubt it's related. That's just the run of the mill win98 memory leak. It's a feature not a bug ha ha ha ha ha..... Strongly suggest dumping 98 in favor of 2k or XP.

How much memory is installed? From past experience I have found that Windows 98 cannot handle more than 1GB of RAM. I had two 512MB modules installed, and had to remove one of them for the system to function properly. Hope this helps.

A machine that restarts with no obvious reason, I would suspect of overheating. Are all the fans working (especially CPU and power supply)?

If this is a newly devolping problem, and no software changes have been made, I would suggest that you open the computer, blow it out with a can of compressed air and verify operation of all fans.

The memory error might indicate a software problem. I suggest downloading and installing Ad-Aware and deleteing any spyware/trojans it finds:

http://www.lavasoft.de/support/download/

In addition to answer 3) check for any user additions - eg ICU, MS Messenger/chat esp if you use any form of x-window or Firewall tunnelling software

There is nothing wrong with the PC hardware, and there is nothing wrong with Win98.
The UPS is dying, and causing the restarts.
There is an "application/thread" that is misbehaving and leaking memory.
Run a memory monitor/thread analysis program,and find the culprit.
Regards, Chris

Yes Matt S, you've got to love those Win98 features. The machine has 318 MB of RAM.

I think all the relevant bases on the power issue have been covered ikn the first few answers, ie the UPS is US.

The memory leakage is another issue. From years of experience I have a personal policy of loading a memory management program on EVERY MS installation that I do (unless specifically instructed otherwise), they all suffer from memory leakage, even Win XP Pro (not as bad as the earlier ones, but does happen).

Set teh memory manager to run in the background, set a reasonable alert activation level and it will clear the memory when available memory gets that low. I used to get lots of 'no memory lock ups' on Win 95 and Win 98 until I started this and haven't seen one on one of my PCs since.

I use a free version of MemTurbo(www.memturbo.com) I got years ago but any of the several available programs will do.

Computers restarting with Win98 are almost always (95% of the time) because of power, either external power (Should be covered if UPS is good) or power supply (Try changing it and running for a couple days). I would think that this is a different problem than your blue screen error. Work on one prob at a time. Make it so that it doesn't restart and then work on the BSOD prob. I'll watch for an answer.