My brand new mid 2011 27" iMac has never been used, and in storage until now. It came with 10.7 installed, but it was an Apple refurb and they sent me the 10.6 install disc last year after I called. This is the last iMac that will run 10.6. I started it up in 10.7, and was able to transfer my files from my G5 using FW, and it is working fine. I then partitioned the HD to install the 10.6.7 system from the install disc on a separate partition. When I first did this, I set 200 Gb for the 10.6.7 partition (from the 1 Tb internal HD). I installed 10.6.7, and it started up fine. Updated to 10.6.8 and all worked well.
Then, I realized it would have been better to use Setup Assistant, instead of Migration Assistant to bring my stuff over to the 10.6 partition from the G5. So, I erased my 10.6 partition, and resized it down to 100 Gb. I reinstalled 10.6.7 from the install disc, got the "welcome" video, and used Setup Assistant (with Target Disc mode as instructed) to bring over my account from the G5. All seemed fine, but when I go to launch the iMac from that partition, it won't load. I get the login screen, with my account name and the Guest Account. When I type in my password for my account, it accepts it, but then I get the beachball and it never loads.
The only thing I can figure is that maybe my 100 Gb partition is too small? I put the install disc back in, and "repaired" the disc and repaired permissions, but no go. I have 77.68 Gb used, 24.82 Gb available, and 102.5 Gb capacity showing on this partition. What gives?