Sounds like motherboard, CPU, or power supply. Have you tried clearing CMOS with a jumper?
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No. Are you suggesting that something's weird with the BIOS? We've checked the settings.
Sometimes it can get corrupted and it won't show up in the settings. There is usually a jumper on the motherboard you can set to wipe out the CMOS. The manual to the motherboard or computer will probably tell you how to do it. Unplugging and removing the motherboard battery for, I dunno 10 minutes or so to be safe, will also do the job.
Not saying it will fix your problems, but it's worth a shot. I have had it clear up weird problems in the past.
Hrm. I've got the manual for the motherboard. I'll suggest it to husband when he comes home. We have had weird things happen to the BIOS on crashes before, so it's worth a try.
Thanks.
It may be the motherboard battery going out. Cheap and easy to install.
Is there any way to check besides getting a replacement battery and testing it? Would the system clock be having problems if it's the battery, for example?
I'm not sure if there is a way to check except replacement, sorry. I was having some similar issues (random shut-downs, gibberish on the screen) and after ruling out overheating, memory, and malware I changed the battery and it worked. Not sure if it will work for you, just wanted to share my experience. Hopefully yours will be an easy and quick fix!
(I was a bit sad it wasn't the motherboard, since I already had my dream computer picked out)
Thanks for the advice! We'll definitely check it out.
The battery should only cost a couple of bucks, so no great loss if it didn't need replacing.
Resetting the BIOS (by pulling the battery) didn't fix the problem. From googling, it definitely sounds like 5 years isn't an unreasonable life expectancy for the mobo battery.
I still kind of suspect that it's a hardware failure, but going out to buy a battery will give me an excuse to get out of the house.