Does anyone have any idea why the power adapter in a Macbook Pro would show an orange light at start up, indicating that the battery is being charged, when the battery was already fully charged (green light) at shut down just a few hours earlier? After restarting the light remains orange for about 40 - 50 mins before it changes back to green. After shutting down my computer I have a habit of switching off the power supply, but when in use I tend to use it like a desktop in that it's always connected to the mains. When going out I make sure to shut it down and do not leave it in sleep mode. I can't see any reason why the computer would use the backup battery to any extent during shut down, especially draining it so much that it takes 40+ minutes to recharge. This orange light/recharge anomaly shows up maybe every 2 or 3 weeks, otherwise the adapter light always shows green at start-up, even after a day of non-use. My mac is about 4 years old and am using OS X 10.6.8.