Ok, I've been fighting my computer for the last month now, and have tried several troubleshooting techniques to narrow down my problem, to no avail. Here's the problem: My computer will lock up randomly during normal operation in the Windows XP OS. The only thing I have narrowed down about this problem is that it will not lock up if I'm playing music. This may just be hard-drive activity that's keeping it alive..I'm not sure. Or it may be linked to the sound card somehow. Some have suggested that it's a motherboard conflict (or mobo hardware failure). I've heard it may be a RAM problem, and I've tested that extensively, with no positive results. I've tried different sound cards (onboard vs sb audigy). I've reinstalled my OS several times (different versions of XP). The Lock-up is instant. No mouse/keyboard input. Monitor still displays the OS (but no activity). Hard reboot is the only way to get it back. When the computer comes back on, no warnings or errors come up. Here's my hardware: -athlon 1.4 ghz -512 mb DDR RAM -asus a7n8x v2.0 (latest bios flash)..Nforce2 chipset (onboard audio disabled, onboard LAN enabled) -sb audigy2 sound card I'm really kind of out of ideas as for troubleshooting goes. I would really appreciate any help (ideas, links, drivers, similar issues)..