When I'm playing games, my screen will periodically freeze for 5-10 seconds and then the monitor will go black, loss of signal. I can sometimes hear the game still continuing and can sometimes interact with it. I'll then power down my system and reboot after a 15 second wait and all will be fine. At first, it was happening once a day, but it's now occuring 2-3 times a day. I'm not sure if it's the cpu dying (this caused a friend's pc to power, not post & no video signal) or if it actually is my video card which is only 1 year old.
My system is about 5 years old and has:
MSI K8T-NEO FIS2R mobo
Athlon 3200+ Socket 754
1GB (2x512MB) Kingston DDR400 RAM
ASUS AH3650 AGP 512MB video card
Integrated LAN & Sound
Windows XP 32-bit