I can't get beyond a white screen starting my imac

This happened many months ago but my imac
evetnually started. Today I have tried several times
to start my imac and can't get beyond the white screen.
I get the mac sound at when it is trying to start up but then freezes
at the white screen.
Any help would be appreciated.
Thank.
Kevin

The following support article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running 10.7 or later) by holding down the key combination command-R at the chime. If your startup volume is encrypted with FileVault, you’ll have to unlock it in Disk Utility before you can do anything with it.
Mac OS X: Gray screen appears during startup

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