D'oh! Apple Pro Keyboard Blues

My new Pro Keyboard works great, but the power switch on the computer won't turn the computer on! It's an older model, a Revision D iMac (333), but I know I've used the computer-mounted power switch to power the machine down before. Am I missing something?

are you running MAX OS X ? What version ? Have you checked your power cables. Able to open the cover, check any burning spots. Try those similar technics first could be some h/ware fault. Consult with your PC dealer for help. Could get some help.. Post back