My MacBook Pro is about 2 years old now, and has worked perfectly fine up until yesterday. Today however, it won't even boot. When I press the power button, the hard drive and optical drive will make sounds as usual, and the small light will light up, but nothing else happens. If I keep the button pressed for a few seconds, the light will start flickering and then everything shuts off again. If I release the button at any time before that, it will shut down immediately. I have already tried everything on this page: http://support.apple.com/kb/ts1365 The battery is loaded, and I have tried starting the computer plugged in, not plugged in, and plugged in with the battery removed. I have also tried removing the RAM and putting it back in, or launching from the DVD, all to no effect. Does anyone know what's going on here?