Yosemite will not install and won't let me change startup disk, it's saying there is a file system problem but disk utilities can't fix it.

I Downloaded the Yosemite upgrade and went to install it on my iMac. The install failed saying file System needed repair. Ran disk utility could do the verify but the repair button was grayed out. When I tried to change startup disk back it wouldn't let me , saying it couldn't gather enough file info. So I'm stuck and can't boot my Mac. How do I get out of this?

Do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Try to reboot normally.
OS X Recovery
OS X Recovery (2)

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Thanks Bob,
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Oh Bum.
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Yosemite will not install and won't let me change startup disk, it's saying there is a file system problem but disk utilities can't fix it.

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