Mac Mini 2010 model. 2.4ghz C2D.
To uninstalled, I deleted the "efi" folder and restarted (I don't know if it's a correct way to uninstall). Then the computer just hangs in grey screen. No apple logo. No response to keyboard/mouse. I took it to Apple store - they offered me the logic board replacement for $390. Another place (Texserver in NY) asked $130 just for diagnosis.
I took out the hard drive, reinstalled Mac OS Lion on the top of the Lion, put it back in, started, the same.
So this time, took it out, clean-installed Mac OS Lion, put it back in, started, the same.
So for the last time, thinking maybe the drive is fried (though I tested it with my macbook and it was booting fine through USB), I changed the hard drive, started, and the same.
I wonder if rEFIt can actually kill hardware.
I'd appreciate any advice / comments.