Plugged external hard drive into brand new macbook to begin moving music files over. Worked fine, but needed to move computer. Moved computer, and plugged external hard drive into 2nd usb port (the one closer to the front of the laptop) and it immediately cut my laptop off!! Cut back on, tried plugging just the usb cord into the port (no longer connected to anything) and it cut off again! Tried reseting SMC (ctrl-cmd-option-pwr or whatever) to no avail. Now charger just blinks this very dim red/orange color and nothings happening. What have I Done?????