Running an Asus P4C800-E Deluxe with Windows XP Professional SP1. When computer goes into standby for long periods of time it will start the case fans, hard drive and power up the CD drives the screen will power up and sometimes display a blank screen with a movable pointer or partially load. Once it loaded then rebooted. When the system goes into standby for a few minutes to 1/2 hour it will return from standby fine. I'm not overclocking and have loaded all updates to SP1. Standard onboard audio and Radeon 9200 128 MB with latest Catalyst drivers. Disabled Legacy USB in bios and have Serial Maxtor ATA on non-Raid channel, CDRW and DVD on Primary IDE. Any suggestions - its pretty much driving me crazy. Also ran Memtest86 several passes without any errors.