HT5361 I have Snow Leopard on my late model IMac. I downloaded Mountail Lion and paid for it from the Mac Store. It will not install. It takes me through several pages and then button to install is greyed out. A message that this disc is used for Time Mac

I have a late mode IMac 27" running Snow Leopard. I downloaded Mountain Lion from the Apple Store and paid for it. When I trie to install it took me through the first few pages of installation such as agrreeing to terms and the Lion Page showed up asking where I wanted to intall Mountain Lion. The install button was greyed out. I also had a message this disc is used for Time Machine. I had no other disc to choose from. Time Mahine was in the OFF position. I tried hooking up an external drive and tried using it as th Time Machine Backup. That did not work and it also said this disc is used by Time Machine. I have read of several other cases like this but have found no solution other than doinh a complee wipe of the hard drive and doing a reinstall which I really want to avoid if I can.

Look at the root of your hard drive for a folder called Backups.backupdb.
Or, a sparse bundle disk image for one of mobile computers that might have tried to back up to your Mac.
If you have those, remove them and try again.

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