Shutsdown enexpectedly when not on AC power
I just got this PowerBook a couple weeks ago
I have been trying to solve this problem for several days. I haven't found any articles with the same symptoms, so I'm documenting my issue here. I may have fixed the problem using tricks from other similar posts, but I'm posting it for anyone who may have the same issue.
When running on battery, If I close the lid on the computer, the system shuts off and I cannot turn it back on.
Sometimes, when running on the AC adapter, the system just shuts off.
Every time I start up, I get the message that my clock has not been set.
The system would shut off any time I disconnected the AC Power
The battery shows a full charge.
Once it shuts itself down, the computer would not turn on. I have to remove the battery, then re-install it for the computer to turn on.
Things that seemed to help:
Since it wouldn't run reliably, I was using it as a "desktop". I had a keyboard, mouse, USB hub and external monitor plugged in. If I pulled the AC adapter, it would immediately shut off. However, If I unplugged all the other devices, it would stay running for a while without the AC adapter.
I downloaded the Coconut Battery program as suggested in another post. It shows my battery is pretty good. In fact, now that It's running on battery, the battery seems to last several hours.
After about a half an hour, the computer still shuts off.
Finally, I followed the instructions to reset the PMU (power management unit). How to reset PMU For the first time, I was able to start / and then restart the computer without having to set the time.
I was considering replacing the PRAM battery. However, if the PMU reset works, this won't be necessary.
I will update this post if this has worked. If any experts have any other suggestions or comments, they are much appreciated.