My imac wont boot  and a small square shows up next to the cursor

Hi
my imac wont boot and a small square shows up next to the cursor. I can open in safe mode. I have reinstalled the OSX, but can't boot from back-up.
Any advice?

OK.....I figured it out.....after reading endless threads on the cursor issue, I found out that apple calls the cursor a MOUSE POINTER..! and the square that follows it a 'corruption'...GO FIGURE!
Anyway, this is what I did.
I tried reinstalling Mountain Lion....online install. It didn't resolve the issue. Same problems
Then, I tried reinstalling from the original DVD install disc....this wasn't possible (no access sign over install icon).
So I finally erased my hard drive (after rebooting command - r), BUT NOT BEFORE BACKING UP MY FILES, APPLICATIONS, SETTINGS and any other important data!!!!!!!
Then started up command R
Then reinstalled Mountain Lion online
My iMac started up like it does when you install 'out of the box'...follow the instructions....
my cursor, or mouse pointer is now free of it's 'corruption', and boots up just fine!
Hope this helps anyone out there with the same issue

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