IMac 2011 21.5" not turning on

I was using the computer and listening to music through the headphones, and out of no-where I hear a pop through the head phones, and the screen went black.  The first attempt to try and turn the computer back on resulted in the fans whirring, and then going dead.  After that, I have not encountered any 'signs of life' from the computer.  I unplugged the computer and let it sit for an hour, but still nothing has changed.  I made a Genius Bar appointment ASAP (next Thursday), and am waiting it out until then.  Does anyone have any suggestions as to proceed from here? Thanks for any input.

Hold down the Option Key when you hear the startup tone, choose the Recovery volume, run Disk Utility - Repair Disk. Then run Repair Disk Permissions  at least 2x and exit Disk Utility and re-boot, again holding down the Option Key and this time choose the internal HD to boot from. If it still gets a white screen take it in for service at your local Apple Store or AASP.

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