Mac HD gone?
The other day my computer froze, so I rebooted it, but then I got the flashing grey folder with a quesion mark on it. I went to OSX utilities by pressing the power button while holding ctrl, and I wanted to reinstall OSX but the Mac HD icon was gone. There's nowhere else to install it, so how do I go about fixing this? (I opened up disk utility but the only thing there was the Mac OSX base system.
Alternatively, is there a way to install OSX onto an external hard drive so I can boot it up temporarily?