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Fortunately, my current motherboard has a CMOS reset switch on the back, and if I flip it back and forth, the computer will start up just fine. Of course, I have to go in and rearrange all the BIOS settings, which is getting old. Normally I would guess this is a motherboard problem, but this is the second motherboard that has had this problem. The first was an Abit IP35-e, and this one is an Abit IP35 Pro.
Is this likely a power supply problem, then? It's a 750 watt Rosewill power supply that is, oh, three years old or so.
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The main reasons I can think of for a computer to randomly shut down are:
1 - marginal power supply. If your system requires more power then the PSU can reliably supply, you can have issues like this.
2 - CPU overheating.
3 - RAM running too fast / overheating
4 - PSU overheating.
5 - firmware bug
Make sure you check all fans are on and maybe use a bottle of compressed air to get rid of any dust on the fan blades and heatsinks. Update your BIOS and motherboard drivers to the latest versions. Get Speedfan to see what temp your CPU is running. If it still happens, then you have to start narrowing it down. Remove half the ram, see if it still shuts down. If so, remove the ram you have in there and use the other ram, see if it still shuts down. If it does, then it's probably not a memory issue.
What kind of PSU do you have and can you give details about the rest of your system too?
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