Help help! I just got my computer back from the shop; and for reasons I can't figure out, I don't have a display. I plugged in all the obvious (I think) plugs, but when I try to boot up, there is no picture.

I'm wondering whether it's failing to get power. I just don't know what thing is supposed to be plugged in. I can call the guy tomorrow, but it would be nice to get an answer sooner.

Arrrrgh.