IMac 21.5inch, (LION) firmware update, now computer won't turn on at all

Received an automatic update window, hit the install and restart button, screen went grey, blue line filled in, computer shut down and i thought it was restarting, but then nothing happened and now it won't turn on AT ALL.

You could try an SMC reset:
SMC Reset
Shut down the computer.
Unplug the computer's power cord and disconnect attached devices.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.

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