2613 Views 8 Replies Latest reply: Dec 2, 2007 12:55 PM by John Huber1
I have 3rd party batteries on both my TiBook and my iBook G4. I am not sure of the brand but I know it is the same brand and I think it is Encore for both computers.
The Tibook (running Tiger) does give me a low power warning before it shuts down and goes into a deep sleep.
The iBook (running Panther) gives no warning and you lose documents.
Since they both have the same brand battery, I am not so sure that the explanation in the previous post fits my case. I rather think my problem is a PMU issue. I have tried the instructions for resetting PMU according to Apple:
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-Power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the Power button to restart the computer.
This does not seem to help my low battery warning.
Also, I don't get any indication as to whether I really reset the PMU. Is there a way to tell? I thought I would lose time and date settings after resetting the PMU but I don't.
Message was edited by: Joseph Vander
+Different Operating Systems might be a factor also.+
The PMU is part of the logic board and isn't affected by whatever OS is installed.
+Any comment on verifying if I really reset the PMU?+
I'm sure it did reset but if you want to test it, shut down your internet connection prior to resetting it. You should get a date and time warning upon restart.