the monitor will come on and display but for only a split second before the screen goes black. The monitor is still on (doesn't go to sleep). To get it back you have to switch it on and then off again, but you only get a split second of display before it goes off again.I've also tried the monitor on another computer but i get the same problem...is there any way to fix this?what could be wrong,maybe a part of it must be replaced?