My PC desktop doesn't show a display, they keyboard doesn't work and niether does the mouse light?

I turn it on everything sounds fine but i got no display on my monitor, my keyboard caps lock key doesnt come on no other lights come on (i know this works) and the mouse laser light doesn't come on(mouse is known to working). The graphics card is integrated and I tried to install a new one but that failed... show more I turn it on everything sounds fine but i got no display on my monitor, my keyboard caps lock key doesnt come on no other lights come on (i know this works) and the mouse laser light doesn't come on(mouse is known to working). The graphics card is integrated and I tried to install a new one but that failed also. What could it be?
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