How to repair the pc that has no beep codes and no display?

My pc has no display and beep codes, when i remove the ram it gives 1 long beep, so it means the mobo is ok and the cpu is ok, I change the power supply, still nothing happens.. Can anyone help me...How to repair the pc that has no beep codes and no display?Video card's output to the monitor may be interrupted/severed. If your video cable is stretched to its limit, try placing your monitor a little closer. If that doesn't work, your video card may be malfunctioning.How to repair the pc that has no beep codes and no display?Usualy if the PC powers on but you get no display its a sign of either a bad video adapter be it onboard or video card or bad moniter.How to repair the pc that has no beep codes and no display?you can try a new video card..make sure the cpu is seated correctly,the heat sink is on right, does the hard drive spin up?How to repair the pc that has no beep codes and no display?TRY ALL THE OTHER SUGGESTIONS FIRST.IF ALL FAILS,RE-INSTALL THE OPERATING SYSTEM.

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