This is the second computer i have built so i am still very new to the whole thing and every now and then while im on the internet or playing a game my monitor will go black and say off mode in 5 seconds, then a few seconds later the sound will cut out and i hafta reboot. @ first i thought that it was a power managment problem but everything there indicated that it wasnt causing the monitor or sound to shut off. my specs are listed below if u could help it would be greatly appreciated.

Thnx,
Swain

AMD Athlon XP 3000+
Asus a7n8x- deluxe
Xtasy 9600XT
512 mb Centon ram
40gb Maxtor Hard Drive
300watt thermal take pw supply
Windows XP Home Edition
viewsonic a7of+ monitor

heat?

Maybe heat problems? Sounds like your graphicscard maybe is overheating? check the fan, the often fail.