Getting no video from motherboard

just got a bundle : asrock p4vm800, p4 3.0ghz, 2.0gb ram.

just hooked it all up in my case with drives and psu.pushed the power buttin, everything was whirring swimmingly.

however, with my tft plugged into the built in VGA port, it was saying “no input detected”

i then tried putting in an AGP graphics card and using the VGA port on that. Same problem.

Anyone got any ideas on how to fix this issue “blind”?

oh, also, the system doesnt beep once when powered up as it used to. if that means anything.