Built a gamer for a client a year ago . . Gigabyte GA-7N400-L with Athlon XP 2500+ Processor, 1 Gig of Crucial memory ( 2 512's) and Chaintec 5600 Ultra video card. Operating System is XP Home ( now with SP-2)
Machine worked fine for a year, then lately started spontaneously shutting down . . suspecting a virus, did a clean install of XP ( with SP-2 slipstreamed) blew out the dust bunnies and cleaned the processor fan, reseated wiring connectors and memory. Updated BIOS and all motherboard drivers as well as the video card.
The spontaneous shut downs continued so I replaced P/S with Antec TruePower 430.
Shutdowns are still occurring with no noticeable common reason. I have set it to not reboot on error and when I look at event viewer, no events show up coinciding with the shutdowns. Temps are all within normal range. CPU 47 - 52, case 35 - 45. I ran the Sandra Burnin to stress it, with no problems . . everything passed. Ran Memtest86 overnite with no memory errors reported.
When it shuts down, I hear a click that sounds exactly like the one when I intentionally shut down. Fans continue to run and it goes to a black screen.
The shutdowns I have witnessed are not consistently, but occasionally: when opening IE . . when clicking on a download . . when opening a program . . sometimes after being on all nite . . but randomly, not every time.
I have tried everything I can think of short of replacing the Motherboard . . any other ideas before I do that?
Thanks . . wrs