Alright so it's a late 2008 MacBook (aluminum). 2.0 ghz intel. I was installing OSX Yosemite when it froze. I left it for a while but the progress bar never increased so I held the power button down to reboot it. Now when it turns on it begins the Yosemite install again but when I select my HDD it says there's not enough free space (9GB). So what are my options here? I now have no OS. Can I boot off a USB stick? Would that actually work? Any help is appreciated. Thanks.