Apple Monitor Problem

There is a problem with an Apple cinema display monitor for an editing suite. The power is on and the light is on for the system and the monitor, but the screen just displays black. We've tried taking the battery out and putting it back in. We've also tried messing with all the wires to check if they were in, turning it off and on, messing with the keyboard buttons and yet nothing seems to be working. So I ask Apple gurus, what could be the problem here? And please don't suggest Apple tech support because they're lame and would be the last resort.

EDIT: Nvm, it turned out to be a faulty internal drive. Took it out and it works. ^_^