Running an Asus P4C800-E Deluxe with Win XP Pro - SP1 with all critical updates and MS Virtual machine - stock motherboard settings. Have 1 SATA drive connected to SATA1 Port and latest BIOS and drivers. When in standby mode - not hibernate system will attempt to return - fans turn on and hard disk will spin but video and system will not resume and basically hangs with a blank screen. This occurs randomly, most of the time the system will resume - even after long periods or time. Othertimes - after only a few hours it won't. Any clues - tried looking at the logs - nothing out of the ordinary. Any clues? Thanks in advance.