One of the things I would start off with is the computers BIOS setup utility under the power settings, see if any options are enabled for putting the computer to sleep.
I would also see what power saving options are enabled in Windows, like turning off various pieces of hardware such as video graphics and hard drives.
Or settings that allow windows to put various devices to sleep.
You set those options to NEVER.
Check your device manager for devices which have allow windows to turn off this device to save power.
These may not resolve your problem, but it's worth a try.
Edited by MrBruce1959, 27 August 2010 - 05:36 PM.