My iMac starts up but gets stuck on the grey screen (with the apple and spinning progress indicator). It's 3 years old and is running 10.3.9. I'm a newbie and don't know much about troubleshooting. I've unplugged everything except the mouse and keyboard. I can start in single-user mode and get 16 lines of white text on black, ending with: Load of /sbin/mach_init, errno2, trying /etc/mach_init Load of /etc/mach_init failed, errno 2 then it doesn't let me type reboot (or anything). I also can't get the disc to open up. The keyboard must be working because it recognized my command S to get into single-user mode. background: We had a power outage last night when the computer was on, so it was not shutdown properly. It restarted fine after the power outage, but 3 times I got this error message in a grey box in several languages that said the computer needed to be shut down by holding down the power button. I hadn't seen this before (is this a new virus or normal?) After the second restart, I was prompted to load new iTunes (and something else) update and restart, and I did so.