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User profile for user: mng01
mng01 Author
User level: Level 1
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MacBook Pro shuts off unexpectedly

So I've had my computer for a while, I think I got it back in March 2006, and around August 2006, I was having trouble with my battery where it would be fully charged, but would automatically shut down when I took the charger out. I went in to the Apple Store and they were able to replace my battery with a new one. Lately my computer gets really hot, so I bought a laptop fan to help cool it down and that helped a lot with how long the battery can last without the charger. This week, my computer began to shut down unexpectedly even at 79% battery life and when I try turning it back on, it'll begin the process of turning on and just shuts down again. As of right now, my cycle count is 246, and my full charge capacity is only 934 mAh. I began to calibrate my battery so I'm hoping it works, but it's not looking so good. I was wondering is there something I can do myself, or should I take it to the Apple Store and if I do, will they even replace my battery? Thanks!

macbook pro, Mac OS X (10.4.11)

Posted on Feb 5, 2008 12:25 AM

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User profile for user: S.U.
S.U.
User level: Level 6
9,595 points

Feb 5, 2008 8:58 PM in response to mng01

You could try resetting the SMC, but it sounds like you may have a defective battery. Here is the link:

http://www.apple.com/support/macbook_macbookpro/batteryupdate/

Be sure and print out the article and take it with you, as not all Apple employees are familiar with this particular battery program. But if your battery meets the criteria, you should be able to get a free replacement.

However, it sounds like you may have developed a heat problem, and this may well be contributing to your battery problems. There are a couple of things to check:

First, run the Apple Hardware Test and see if you get any error codes that might indicate a failing thermal sensor (SNS) or fan (MOT). Use iStatPro to check that both fans are running and that they speed up with the heat and that both run at about the same speed.

Second, open Activity Monitor and set it to show all processes and look for some process which is using a lot of the CPU. Sometimes these things will run in the background and cause excessive CPU usage and heat.

Good luck!
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MacBook Pro shuts off unexpectedly

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