I have recently been having lockups on my PC ... AK77-600GN AMD Athlon XP 2600 Barton 512M DDR400 MX4000 AGPx8 128-DVI .... the machine would lockup anywhere between 10 minutes and 3 days from power up. If I ran a Virus check it would almost always lock up after 10-30 minutes of the scan. I changed loads of settings without success (and then set them back). Recently I changed two BIOS settings and the machine has been running for a week now. I changed the clock multiplier from 166 (x11.5 = 1.9GHz) to the minimum of 161 (now 1.85GHz) I also enabled 'HALT Command Detect' (default is Disabled) Could either OR both of these settings have helped or am I just lucky? I have read many threads about overclocking problems on AOpen boards so I presumed it was fairly sensitive to it - therefore it may prefer under-clocking. My Case/CPU/Disk temperatures have not dropped. I have also read about the HALT Command setting along with "Disc When STPGNT# Detect" (which I cannot find) causing the temperature to drop 4-5 degrees because the processor goes idle when there is nothing to do.