Hi all. So I bought a new HD for my Macbook Pro mid-2012. I've installed Mountain Lion (lol) onto the HD from my other Macbook, in recovery mode. So I've plugged the HD in, started in recovery mode, and nothing's showing on Disk Utility – except for a 'disk0' drive with 'Mac OS X Base System' under it. Any ideas? P.s. - it's not the cable. I plugged in my other Macbook's HD and everything starts fine.