My iMac intel core5 stopped working today.  Couldn't hard restart.

Screen lights up, nothing else but the whirling icon.  Aside from taking it in to the store for service, what are my options.  I bet the hard drive that has the startup disc is fried.  I have a time capsule and another external 1T back up drive, and I assume I should bring both drives along with the iMac and may be necessary for restoring data.  What should I do.  Thanks.

You might try an SMC Reset and a PRAM Reset to see if that will then get your iMac started, as offered by expert user Rkaufmann87:
SMC RESET
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and 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.

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