My screen's gone dark, and no amount of button pushing is working. Help!

Black screen. Nothing.
I unplugged, no help.

You need to post more information, telling us the screen has gone dark isn't very informative. The first thing you can let us know is what model iMac you have, what version of OS X and how much RAM it has.
You can first try doing a SMC reset, you may need to try 2-3x. If that doesn't help try re-starting in Safe Mode.
SMC RESET
• Shut down the computer.
• Unplug the computer's power cord and all peripherals.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Attach the computers power cable.
• Press the power button to turn on the computer.
PRAM RESET
• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Roger

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