I just purchased OS X Mountain Lion Upgrade.  When I went to install it is says "Os X Mountain Lion cannot be installed on Macintosh HD" please help!

Just purchsed upgrade OSX Mountain Lion.  Went to install and it says "OSX cannot be installed on Macintosh HD" Why?

Hi,
If you bought the iMac in 2010 it should be supported indeed, however be aware that the information refers to the manufaction date which might be different than the purchase date.
Please verify the following information:
Click the Apple icon.
Click About This Mac.
Click More Info.
What is the listed Model Identifier?
You may identify the exact model by comparing it with the Model Identifier below:
http://support.apple.com/kb/HT1758
Now go back to your Desktop, click the Go menu and select Utilities.
Open the Disk Utilitiy.
Select Macintosh HD from the left pane.
You may find the Available space listed in here.
As well, what it the listed Format within the same screen?
Shlomi

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