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Computer turning off and on, on its own....

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There is a very high concentration of Wifi signals, maybe that's it???

I figure the auto turn on could have been a USB splitter I had hooked up, I noticed when the machine was off the light on it was still on, and I remember reading how that can trick a power supply into thinking its time to start up.

But even unplugged, walking passed it was causing it to restart. If it was power related, I would expect the BIOS to keep the system off. I have seen a bad video card restart the system before, the black and white would indicate video card problems, but how can it be when I only walk passed it???

Maybe it's time just to replace some of the core components again, they are getting strange, time for a new mobo, video and power supply?