Monitor Going to sleep

hey ive been having a problem with the game!....after playing a couple of rounds my monitor displays this message "monitor going to sleep - no input signal"

tried many things to fix it , reinstall Graphics card drive and updated, clean the computer for overheating,

and the funny thingk is that i could play anygame like wow or left for dead and nothing happens but when i play cross fire monitor goes to sleep is really annoying,

PC: HP media center m8120n
processor: Intel(R) core(TM) Quad CPU @2.40 Ghz
memory ram: 3070 MB
system type: 32 bit
monitor: hp w2207
Graphics card: Nvidia Geforce 7350 LE

if u can help me please!....ASAP!!!!

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