IMac (Intel) only displays white screen with Apple after power-outage

Last week, we had a power-outage.  iMac is plugged into a surge protector. When power was restored, powered up the iMac, but it will not get past the initial white screen with the Apple logo and the spinning black/white wheel.  I have tried shutting down and re-starting, unplugging and re-starting, etc.  Nothing happens.  Ideas?

You HD probably crashed. Please run Apple Hardware Test in Extended Mode and see if it reports any errors. If it does please post them and we will try to translate them.
Also if your area has power issues I would strongly recommend replacing the surge protector (which is worthless in a power outage) with a UPS. A Uninteruptable Power Supply has a battery in it that is designed to provide enough power in the event of a power outage so the computer can do an orderly shutdown. I recommend the APC brand, you can find UPS's at your local office supply store or even Costco. A good quality one will cost about $100.00 or more.
Roger

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