My Girlfriends iMac wasn't plugged into a surge protector or battery backup when the power went out a few weeks ago. Initially it wouldn't start backup, so I started it while holding the 'Shift' key. It started sloooooooooowly with a grey progress bar at the bottom under the apple logo...now everytime it starts it takes forever, and the progress bar is there. Is it something I did, and if so, how do I put it back? I've never seen this before. I'm going to try and attach a picture.