That is a RAM issue, it's called ram memory corruption. It may be the shared ram to the GPU, the entire system ram or just the bus not being able to transfer data from ram to GPU. If it's the ram, at each click, movement or animation the pattern (that technically is called garbage or corruption pattern) will change, like pixels changing color or bars moving like worms. If instead the pattern is consistent it may be the bus not able to deliver data to the GPU. In either case the solution is to change the motherboard.
