My MacBook Pro gets stuck on the start-up screen with the Apple logo and the loading wheel. -I have reset the RAM using Apple-Ctrl-P-R during start-up. -I have reset the power-source by removing the AC cord, the battery, and holding the power button for at least 5 seconds. -Just to be sure, I also performed a defragmentation of the HDD last night, which have helped with other boot issues have had in the past. -Repairing permissions with the Leopard Install disc is not an option, as it is at home, across the country -I attempted to boot using my old Tiger install disc, but it sends me to the installer screen (figured it wouldn't work, just tried to be sure) This problem started after using my MBP on battery power. I wasn't given a "low battery" warning. Instead, it shut down and hasn't been able to reboot into the Mac OS since. However, I can boot into Windows just fine. I'm kinda freaking out, thanks for any help you can offer!