Monitor won't turn on when computer starts

Hello TechSpot! Very helpful forums you have here so I thought I'd join and see if anyone could help me out, as well as help out others while I'm here. Anyways, I'm writing this As I drive over to a friends house who's computer won't display anything on the monitor when he starts it. Everything is new. I will check to see if it even beeps but he says it does. Any ideas to get me started? He has tried different monitors and video cards and still no luck.
 
might just be a dodgy VGA/HTMI cable or power cable plugged in at the wall, try the screen on another computer or laptop
 
Never mind, for some reason its working just fine now. After we took out his video card and I popped out the CMOS battery for a few seconds, it started working just fine. Thanks for the help DKRON
 
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