I've done a bad thing. I was originally able to partition my drive and install rEFIt, and my mac was booted from the external DVD drive while holding 'C' just fine, but I aborted the Ubuntu install abruptly due to impatience by shutting off the computer holding down the power button. It was very early in the install process when I shut it down. Now the mac wont recognize any external USB device at all, even after a clean install of Mountain Lion and rEFIt. Not even in Finder.
Any ideas? What did I kill?
Thanks all.
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