MBP 2.4 GHZ 4GB ram (used to be 2G) Basically, without the power attached, the computer shuts off after around 20 minutes. I can still see that the power is almost full when it shuts off. I started NOTICING the problem after updating the ram, but there is a (small) chance that it started before. I tried removing the battery and holding down the power button for five seconds, and putting it back on without any results. Any advice?