Having some really strange behaviour from my mac pro (2008) today. I was trying out Windows 7 build 7000 (HDD is partitioned) and rebooted back into OS X, however it would just sit there with the grey Apple logo and spinning circle. So I restarted again holding down the alt key and selected OS X again but the same problem occured. Booted the OS X installation disc and did a repair permissions and repair disk, restarted and same thing happened again. Booted into console with Command-S and ran "fsck -y -f" and still couldn't get into OS X. I tried one last time with Command-V and this came out: Has anybody experienced this before? I do have AppleCare.