IMac won't start- just spinning pinwheel

iMac was working fine.  Got unplugged and now won't start-up.  Just get the spinning pinwheel with Apple icon on screen
Any thoughts or suggestions?
Thanks
Joe

Read this: http://support.apple.com/kb/ht1547 You most likley have a problem with your ram

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    MarkWelcome to Apple Discussions.
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    When you said 'started with the screen freezing' do you mean Kernel Panic, blank screen or the SBBOD?
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    I am writing about my other laptop, a 15 inch MacBookPro 2.16 Intel Core Duo running Mac OS X 10.4.10.
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    Re: http://www.alsoft.com/
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    Message was edited by: ChrisRR

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