My Late 2010 model Macbook Pro decided to no longer boot today. At first, it turned itself off, and after a few reboots, it let me back on and worked for a few hours. I thought maybe it was the power adapter because the cord got cut a little. So, I switched to my Macbook charger. After those few hours, it did it again. This time it allowed me to be on for about 10 minutes before it did it one last time. Now when I press the power button, I no longer see video as it doesn't even allow itself to make it to the "bootup chime" before deciding to turn back off... It just does the whir, then shutsdown. Any idea what it might be? The battery indicator on the side says it's got a full battery.