I got 2x 450 with SCSI, 2nd internal HD, and 2nd Video card...I'm not sure the SCSI card has to do with it though. I know I can only get X to boot for me if allm y SCSI devices are unplugged, my 2nd monitor is in, and my 2nd internal HD is off, sometimes the 2nd HD can be on though that's weird. But I can't sleep either, I determined it is either the SCSI card or my second video card...b/c sleep was iffy in 9.1 b/c of my second video card. But I know USB is not it b/c I got a kensington webcamera, macally mouse, and a gravis gamepad...They just arn't recongized by X.