I was working on my Mac mini (Lion 10.7.2) when the power went off. When the power came, I started Mac Mini. But it keeps on showing grey screen with activity indicator forever. It wont start the system.

I have tried Repair Disk, Repair File Permissions, but still it wont start.

How do I resolve this issue?


Apple has guidelines explaining what to check for:

Mac OS X: Gray screen appears during startup (support.apple.com)

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