SAPPHIRE ATI hd7770 no display the next morning

My PC run great for few week after install new Sapphire hd 7770 Ghz edition. Just recently when i left my PC on for downloading overnight the next morning, when i on the PC my monitor not display anything. The PC still function bcos the num lock still functioning and the PC still downloading from the modem data still on activity, Just that the monitor not display anything. I wan to know what the problem, is my card faulty??

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More about sapphire ati hd7770 display morning
  1. Well, you can pinpoint the problem if you can borrow someone else's graphics card or use a video output that is connected to your motherboard. Also, you might want to try a different monitor, to see if that could be the problem.
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