Stumped: Late 2007 MacBook won't run on battery power.

[skateny]

Hi.

I'm not new to OS X, but I am new to MacBooks.

I've recently been using the MacBook in the title:

Model Name: MacBook
Model Identifier: MacBook3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 1 GB
Bus Speed: 800 MHz
OS: Snow Leopard, 10.6.8

It's been lightly used over the years, and never had a problem. Yesterday, the Mac immediately shut down after I removed the AC adapter. Each time I tested this, I got the same result. I ran Disk Utility, and everything is reported as fine. The battery is recognized and reported as fully charged in both the menu bar and System Profiler.

I've rarely used the MB with battery power, and the battery is in good shape. I was working on it about a week ago for about two hours with the battery alone. It had plenty of power left when I plugged in the AC. I don't have a spare battery to test.

All help will be greatly appreciated.

 

[rabidz7]

Does it work when booted direct from battery.

 

[minifridge1138]

Hi.

I'm not new to OS X, but I am new to MacBooks.

I've recently been using the MacBook in the title:

Model Name: MacBook
Model Identifier: MacBook3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 1 GB
Bus Speed: 800 MHz
OS: Snow Leopard, 10.6.8

It's been lightly used over the years, and never had a problem. Yesterday, the Mac immediately shut down after I removed the AC adapter. Each time I tested this, I got the same result. I ran Disk Utility, and everything is reported as fine. The battery is recognized and reported as fully charged in both the menu bar and System Profiler.

I've rarely used the MB with battery power, and the battery is in good shape. I was working on it about a week ago for about two hours with the battery alone. It had plenty of power left when I plugged in the AC. I don't have a spare battery to test.

All help will be greatly appreciated.

It sounds like your battery is dead.

What are the stats on your battery? Number of cycles, health, etc...

 

[skateny]

It sounds like your battery is dead.

What are the stats on your battery? Number of cycles, health, etc...

Thanks.

Both System Profiler and CoconutBattery report the battery is healthy with a coupla hundred cycles left.

After resetting PMU and SMC, other things happened -- including unwarranted and unnecessary fan operation -- that indicate a dead/defective PRAM battery.

I picked one up at powerbookmedic.com for $1.30 plus shipping.