recently i assembled a 3.2 ghz mainboard is INTEL D100 it is working properly but some TIME i doing something HARD with pc at the time graphic moving like a wave then difficult to see the monitor also what?s wrong with this what should i have to do nowDo you know what graphics card you have? COULD be a heat problem. TRY updating your drivers first. And try another monitor on that PC, let's see where the problem is.