Imac does not turn off.

hello,
I have an imac, running on os x lion. u know how, when you click on shutdown, it shows the white screen. sometimes my imac does not turn off and keep showing it. could you please tell me what i can do to solve this problem.
thanks

The safe boot more or less resets system files.
When it is something in the hardware:
1.do the Pram and the SMC resets:
http://support.apple.com/kb/ht1379
http://support.apple.com/kb/HT3964
2. shutdown the mac and startup while holding the ALT(option) key: choose the Recovery Disk, from the window choose Disk Utility, select the Lion disk, choose "repair disk".
When it is not a hardware problem:
3. List the applications you installed in the last 6 months, also the ones from the Appstore.
4. List the plugins (extensions) you have in Safari.

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If all the prior steps have not resolved the issue then at this point I would suggest:
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