Hi everyone, Haven't posted on here in a while, but my MacBook is having a problem that's driving me crazy. This is an original 1.83Ghz MacBook (17 months old). Never had an issue before and I use it all day, every day. When I was using it last night off battery power, when there got to be about 40 minutes left (2 green lights on the actual battery), the MacBook completely shut off. No warning, no nothing...screen went black and it was totally off. I wasn't sure what happened so I tried to turn it back on but it was totally dead. Plugged it in and noticed no light on the MagSafe. I pressed the power button and the MagSafe turned green for a split second, then amber, and the MacBook started up. I let it charge up to 100%. Fast forward to tonight. Again, running off battery power, about 40 minutes left it completely shuts off. Same thing about not starting and the MagSafe. Now even though it's shutting off with about 40 minutes left, I'm getting a bit more than 2 hours battery life before it's shutting off. I'm not sure if it's actually dead or it just think it is but still really has 40 minutes left. What could be going on? In System Profiler it says Health Information: Cycle count: 51, Battery health: Good. However in CoconutBattery, it says I only have 7 cycles on the battery (yes, seven) but says the battery capacity is 91%. The 51 cycles is the correct number. While I don't run off battery power that much (51 times in 17 months proves that...), I have calibrated it as necessary and it has never given me any issues before. Any ideas? Any ways I can get this thing into shape? I figured I would need to run it completely empty and charge it back up to get it back into shape, but there's no way to discharge it if the computer shuts off at 41 minutes. Thanks!