My MBP was closed and in sleep mode, but powered on.. It fell about 3.5 feet, and it landed on the carpet. It seemed to hit on one of the longer, skinny sides of the laptop. I'm using it now, and it seems to be ok. I have dropped it from about 2 feet before while it was on and not in sleep mode, and it was alright. Any thoughts here? How would I know if there were any issues?