Do you have a different monitor you can test it on? If you do then you can figure out if the monitor is the problem. Also do you have a different video card, or you can use the I5 onboard graphics. If you switch video cards (or use onboard graphics) and the problem goes away then you know your video card is the problem.
when i use the on board graphics problem appears, with a video card it goes away , i also tested my processor in an other board every thing worked fine, it means that there is some problem in my motherboard, can you tell me which component of motherboard is causing this problem.