Stephen John Smoogen said...
|Ok this sounds like a bad mobo or some BIOS setting that is putting
|the box in a 'sleep' state. I don't know what kind of keyboard your
|system is but I have seen this on a box with a USB keyboard/mouse set.
I have seen this with a USB keyboard when there's no console
input, but it always (for us) happens within a much shorter
period of time, like 15 to 30 minutes. But it wouldn't be a
bad idea to hook a PS/2 keyboard up instead, if you have a
USB keyboard now.