Ok heres the story, 2 weeks ago im playin World of Warcraft and out of knowhere my computer monitor just goes black with the little blue box msg saying something like cant fing signal, so i turn my comp off, and when i turn back on it still wont recognize the monitor. So i leave it on overnight come and try to turn comp on next morning wont even turn on, its like it gets power for like 1 sec and just turns off. So i took it in to a computer place, and when they looked at it it ran fine, it started running fine and everything. But now whenever i play a game it seems, well pretty much WoW i lockup like every 10 min, when my screen just freezes all backround sounds turn off and my computer is doing nothing it seems but still on, other times it locks up too and the screen goes black ike i said earlier just like when the computer isnt on. Ive reformatted, reinstaled games, drivers, you name it still is doing it, and just seems like its getting worse and not taking as long for it to happen. Thought it was only in the game to when it would lock up but now it locked up today when i started typing this. If anyone please has some advice or knows what the heck is goin on please help me, its impossible to play my fav game with my comp locking up every 10 min. thx guys

oh yea and btw, i have a:
watercooled athlon 64 3200+ not overclocked, radeon 9800xt, ga-k8nsnxp mobo, 2 80g western digital HD, and running XP home

Check your temperatures.

My temp for processor idles at about 36c and my graphics card is idling at 55c, thats cooler than normal i believe, so i dont think overheating is my problem