Hi Guys, I have a Macbook Pro from 2007 (aluminium keyboard). Everything was working great until a couple of days ago, when I replaced the battery. No every time I choose to shut down the computer, it will restart and NOT shutdown. I have tried several things - the only thing that seems to work is to unplug the power chord - then it will shut down, but if the power plug is connected, the computer basically can't shut down - it just restarts. Any thoughts?