Hey Guys, We got a 27" iMac in that we're actively trying to screw up. It's a 2.8Ghz i7 with 16GB of RAM. It was password protected, so one of the other employees tried to to a factory reset with the boot disc. Before he finished it up, his shift was over, so he just turned off the power. I think he was in the stage of just trying to boot off the disc. Now, when I turn on the machine, I just get the white screen with the apple in the middle and it stays that way for hours. The disc is in the machine. How to I get back to start?