HT3964 iMac turns on but wheel keeps turning but nothing happens

I turn on computer sign in  wheel turns but nothing happens. Help please. Huka

Did you do any of the other suggested stuff?  For example, boot from your recovery partition and run Disk Utility to repair/verify you drives (not repair permissions).
Do I take it your reference to "shift" was to boot in safe mode?  If so you did you really boot in safe mode?  Did you push the shift immediately after the boot chime?
Did you remoeve all additional periphials (firewire's, USB's)?
You might consider running the Apple Hardware Test.

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