My system is like this- not overclocked or modded Athlon 1.4 ECS K7S5A mobo 350W jeantech PSU ATI radeon VE asus cdrw 52,24,52 LG 52X cd modem I have been having a problem that whenever I open a game the system will simply reboot. It gives a loud beep, black screen then reboot, it then runs scandisk and often finds lost chains. It occurs with a variety of games all that have previously worked on the system under 98 and XP. It seems able to do most other things without crashing but gaming is the most intensive test I give it. It runs 3d mark 2001SE fine and gives the same speed it always has. The hard disk had been loosing clusters for a while so was replaced- no improvement, the ram was replaced- no improvement. flashed bios with latest update- no improvement Anyone have some ideas?