Can't shut my imac down or restart. Keep getting a pop up message telling me to click continue as there is apparently an untitled disc waiting to be burned. But there is no disc in the optical drive. I click on continue but nothing happens. Lion os.

Originally posted by ddp:

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have you tried holding the power button down for 8-10 seconds to turn off like a windows machine does?

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No, I never knew that.
I pressed the power button for only 1 sec but the imac just went into sleep mode. I finally got it to shut down by doing a force quit on Finder. I would have tried this option before posting to this site but there was no force quit tag option for Finder, just an option to relaunch which confused me. Eventually i clicked on the relaunch option and it shut down.
Thank you.
I had noticed earlier when I was doing file verifications and repairs that there was a warning that SUID was not able to be repaired. Any idea what SUID is?

Originally posted by JST1946:

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This may help you to understand what SUID stands for.
https://discussions.apple.com/thread/2243661?start=0&tstart=0

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What a relief. Thank you very much.