My iMac has a white screen and won't power up

When powering on my Mac, I get a white screen with apple logo and the circular progress icon (not the color pinwheel), it's been doing this for about 15 min. Suggestions????

The dark gray Apple is loaded off your Hard drive. So you can assume the Hard Drive mechanism is somewhat working.
You can try Booting is Safe Mode, which attempts one round if Hard Drive Repair and then starts with minimal extensions loaded.
The simplest task is to boot with the Option key held down. This should show a screen with an Icon for each bootable drive.
If running 10.7 choose Recovery HD, choose your language and run Disk Utility. Select your Hard Drive and Repair Disk.
If running 10.6 insert the Installer DVD, select it, boot from it and choose your language. Choose Disk Utility from the Utilities Menu. Select your Hard Drive and Repair Disk.

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