Monitor turns BLACK !!

[Guest]

hey - please someone help me !!
i have the prob that from time to time my monitor gets black
so that i have to restart - this also happens when i am surfing the net
this prob appeared all of a sudden,out of nothing
does anybody have a clue what could be the cause ????
thanx .............
: )

 

[Crashman]

While your using it? did you try turning the monitor off and then back on? If that doesn't work, it's probably your video card.