This seems to happen randomly when using browsers 
#Bad display
last forum
craggy galleon
Something not right with ur graphics card. Does it run hot? You could try getting it out, blow out the dust, reseat it and fresh install the drivers.
If its very old it could be just dying
last forum
Something not right with ur graphics card. Does it run hot? You could try gettin...
I don’t have a graphics card yet do you think it could be a ram issue?