Mountain Lion won't install on mid-2010 iMac with Snow Leopard

Using the same Apple ID I used to purchase Mountain Lion on my Mac Pro, I signed into the Mac App Store on my iMac and downloaded Mountain Lion with no issues. The iMac is running 10.6.8.
When I launch the ML installer and accept the terms, the install screen appears but the Install button is greyed out as is the icon for my hard disk, Macintosh HD. Below the OS X Mountain Lion banner it says "OS X cannot be installed on "Macintosh HD".
Snow Leopard was installed on this machine as part of a family pack and I still have the DVD. Nothing shady going on license-wise, is I guess what I'm saying here.
Anyway, no reason is given and no options are offered other than the Back button at that point. And I can't seem to come up with anyone having a similar issue in all my "research". So any help or insight would be appreciated.
Thanks,
Doug

I recommend backing up your system, and before going into the install, checking disk utility > verify disk > macintosh hd partition > to make sure the partition is okay.
If there is anything wrong with it, you will know here. Sounds like the disk may be locked or there is an issue w/the partition "macintosh hd"
also, maybe the partition was created incorrectly... check to see if the partion is MAC OS EXTENDED JOURNALED and not case-sensetive

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