I'm dealing with an Optiplex GX280 that was randomly freezing and then randomly shutting down. After a little bit it stopped turning on altogether and the only things that would happen were that I would get a yellow light and I could here the CPU fan speeding up to it's max speed. After I reset CMOS it started up normally again but after a bit started randomly freezing again. I'm rather puzzled. Could it be the PSU? and if so why would resetting CMOS make it start up again?
Other info: Apparently there is a common problem with capacitors on motherboards of the GX280 (see this thread) but if that were the case resetting CMOS wouldn't have fixed it, so I'm leaning toward the PSU, but then why would resetting CMOS fix it and why would fan speed up?
Any help is apreciated, thanks.