Won't boot to osx

I ran a scan of my hard drive using drive genius which said I had bad blocks on my hard drive. It said to erase disk and reinstall from a backup. I did this and reinstalled from a time machine back up. Now when it tried to reboot all I get is the gray screen with apple logo and spinning gear. Any ideas what happened?

What you need to do is hold command r keys, boot from the Lion Recovery, use Disk Utility there to Erase with Zero option the Lion Partition, this will map off the bad blocks.
Then use TM to restore from.

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