So basically, my MBP decided to not respond to any inputs except the power button. This includes during boot, so I can't boot from an OS X disk, go into Boot Camp, etc, etc. I've tried resetting the PMU (which also resets the PRAM, right? I can't reset the PRAM because it won't recognize any keystrokes during startup). It was working fine last night. I put it to sleep, then when I opened it this morning, it stopped working. Help?