Mountain Lion has messed up my IMac !

On installing Mountain Lion as a upgrade on one of my studios IMac's, it would not only not install, but will now not revert back to the previous version - message is "hard drive has a problem". Now what! I can't run this computer at all - it was fine before I decided to upgrade!! Grrrrrr.

Have you tried using Disk Utility to look at and possibly repair the drive?
The proper installation of Mountain Lion (or any OS software) will not damage a disk drive, at least not at the hardware level. Perhaps the format of the drive just got messed up. What steps did you take in updating the system to ML?
If the system is still under warranty you're best course of action would be to start a service request on it.
regards

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