[Stammer]

Every so often at random intevals wether my PC is idle or in use it will either lock up (Only when in Firefox) or my moniter will go black as if it had went into standby mode, anything I was doing will stop, if I were playing music or a game it would stop. The only way for me to get visual on my moniter again is to turn off my PC and turn it back on. This is becomming a big problem and I'd like to take care of it.

Moniter : ViewSonic G71F+
Video : eVGA GeForce 6600 GT 128mb
CPU : Intel P4 3.0Ghz HT
Mobo : ASUS P5800
Harddrive : Maxtor 300GB 7200RPM (New)
Sound : Audiy Sound Blaster LS 24-Bit
Memory : Corsair Value Select 1GB (512x2)