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DO NOT ENTER sign on boot up

I was organizing some audio files when Finder froze up. I had no option but to reboot, but then when I rebooted an internal drive wouldn't appear... as though it's vanished. And now I can't even boot up because I get a DO NOT ENTER symbol on start up.

Help! What is happening? I've tried Disk Utility and Tech Tool Deluxe. Both say everything on the main System drive is fine.

Power Mac, Mac OS X (10.4.11), 2x3 Ghz Quad-Core Intel Xeon - 16G Ram

Posted on Oct 9, 2009 8:20 PM

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DO NOT ENTER sign on boot up

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