Windows 7 crash - Black Screen

i played world of warcraft while i listened to music.. suddenly the screen started to blink and music stopped up. i got a blue screen error.. now when i try to get to where i log in, after the windows flag shows up the screen goes black. nothiing happens. it works in safe mode, i checked computer for virus with microsoft security essentials and there was none. i tried startup repair, system restore and meorial diagnostics.. anyon got a sollution? i would be REALLY glad to get some help. this is really ****ting me.:upset: