Hello everyone- I've been using my 15" i7 MBP a lot recently, in clamshell mode with an external keyboard/mouse/monitor. While I was using it, the keyboard and mouse became unresponsive, and I looked under the mouse to see that the optical sensor was no longer lit. I ended up restarting the computer, just to see, but no change. I tried a thumb drive in the same port (further back) and its activity light lit for a split second, and went dark. Did the port REALLY just fry WHILE I was using the system?? I have classes...I can't have repairing this thing forever.