Tried 2 monitors but will not come on

Turned computer on after two days off, the monitor will not come on i have tried two of them both previously worked now neither do, flatscreen says no signal old monitor nothing please any advice?
 
If you know your way inside the computer's tower, trying finding the BIOS reset switch & use that. See if your computer can at least POST.
 
connected jumper cap to clear CMOS but still no joy with the monitor, all else seems to be connected fine???????
 
Did you set it back to its original position before powering back on the computer ?
 
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