I have a MBP and it started going nuts the other day. If it is running and I reboot it (from insides OSX) it will reboot. If I power off and try to turn it on by pressing the button it comes on for a second (at best) and goes right back off. The only way it will boot is if I press AND HOLD the on button until it beeeeeeps and then it will boot up (rather slowly). Once it is on it appears to work fine. Any thoughts?