Problem

well my screen decided to shut off when i was playing uhh windslayer... not sure why... so i tryed to turn it off then turn it back on and that didnt work so i had to restart my comp... and this happens everytime... i play for like 10min then it just shuts off.... know idea why...24inch lcd screen... ati radeon hd 2600 XT...
Processor intel core 2 quad cpu 2.4 ghz 2046ram 32 bit

Try pressing alt+tab while this happens, if it minimizes the game, it's probably changing resolutions by itself