Start by making sure there's no dust on the cable's connectors at either the PC's end or the Monitor's end. Also ensure nothing heavy is sitting on the cable (ideally that nothing at all is on the cable).
Well the cable is new, and nothing is on top of it. However going back to the question this screen thing happens when i play videos mostly. Exactly when i hit play my screed does this. Can you suggest anything else that i can check software wise. Thank you for your time