I purchased a compaq presario 2100 off ebay. It was listed with a broken screen but running. I replaced the screen but still shows no video external or internal. On start sometimes all led lights and fan come on and stay on, other times they come on and all go off but the power led light. The screen I removed was a mess I was wondering if it could have shorted the video on the motherboard, or if maybe this is the processor or other mb hardware. Battery charger works, dvd-rom works. I am at a loss. I am a newbie to this forum and computer repair so please speak in lay terms.

Thanks,

Billy