I'm running an AMD Athlon XP 2500+ (Barton) on an A7N8X Deluxe Mobo with 512 MB of PC 2700 (2 X 256 DIMMS). I'm using Windows XP Pro. My PC was on and running fine, I left it for a while and when I came back there was nothing on the monitor screen. I juggled my mouse...nothing. Restarted, the PC powers up, but nothing on-screen. Checked inside, everything seems fine. I tested the video-card in another machine and it works. On thing I notice is that the HDD LED stays on when the PC is off. Is this an indicator of anything specific? Can anyone help?