Screen Problem

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Hey

I have a problem ith my screen, sometimes it keeps going black and before it goes black it has lots of diferent coloured dots / squares on the screen, not always in the same places..

Some times they go away and some times they get really bad and have to reboot it.

I happened after I moved my PC.

What could it be? The Monitor lead is damaged? Beacuse when I move the mointor lead it happeneds again.

 

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Ok, I How do I reset the G Card?

Cant replace the Mointor lead due to it being stuck in the back of the mointor, so I may need to buy a new one.