I have a Macbook Pro 8,2 that will not turn on when hitting power button but will turn on with SMC reset. As long as I move the mouse or hold down a key on the keyboard I can do anything on the machine. Around 5 seconds after I stop moving the mouse or stop holding down a key the machine will pop up a windows about shutting down then it will go down hard like I was holding down the power key. The power key itself is not physically stuck. Anyone ever seen this problem before or have any advice on how I can troubleshoot this problem?