Ok, I have a 15" 2010 MBP. Every time I shut the computer, the sleep/wake light sensor thing stays still (it doesn't blink like it's suppose to). Therefore, once i open my computer, the login screen screen looks like it has been on when the computer is shut...it is weird. However, I noticed that it only happens if the charger is hooked up to it. Is this a hardware issue? a software issue? new issue? old issue? I know I probably described this terribly, but I have no idea what is going on.