Resetting the Power management unit

I have a 12" Powerbook G4. have been having problems with the battery, would charge fully, with coconut battery, would show 4081 as current battery capacity.
It would drain down to around 79% then immediately go to sleep and when plugged in, battery would show 0%.
I want to reset the power management unit, and see if this might solve the problem.
I've followed the instructions
shift-ctrl-option-pwr button
After I do that (I've done it with the power cord connected, with it disconnected, and with it disconnected, and the battery disconnected). The time doesn't reset. I had thought that the time was supposed to get reset. Can anybody confirm that this? is there any way to know that the powermanagement unit has actually been reset?
Just want to try a few last things before spending the money on a new battery. btw, the computer is about 3 years old.
Thanks.

This line:
Full charge capacity (mAh): 5893
and this one:
Cycle count: 60
indicate that the battery is healthy. However, the voltage, at 15961, seems high. However I can't compare to my PB17 right now because my daughter borrowed it.
Maybe someone who has their PB handy can compare their numbers.
If the battery is healthy and the a/c adaptor seems to be working, that leaves the internal power circuitry as a suspect.

Similar Messages

How do I reset the power management unit on a Mac Pro laptop?

Screen flashes as the system alternates between battery charging and charging complete.
How do I reset the PMU?

MacBook Pro
MacBook Pro Apple Support

After a one week logout and shutdown my macpro 1,1 laptop shows a black screen at startup attempts. The battery is fully charged and both resetting the power manager and zapping the PRAM have failed to permit startup. What else can I try?

After a one week logout and shutdown my macpro 1,1 laptop running OSx 10.6.8 shows a black screen at startup attempts. The battery is fully charged and both resetting the power manager and zapping the PRAM have failed to permit startup. What else can I try?

Startup – Black screen with cursor
Startup Issues - Resolve
Startup Issues - Resolve (2)

Reset G4 Quicksilver Power management unit

Powerbook G4 Mac OS X (10.4.3)
My G4 won't start. It may be the Power Management Unit. I want to rest the PMU. I can find nothing on resetting the power management unit on a Quicksliver desktop G4.
Any suggestions?
Jay Leonhart

I am having similar problems looking for the quicksilver pmu instructions, but these should be close.
http://docs.info.apple.com/article.html?artnum=95037
there is a lengthy discussion of it here as well
http://forums.macosxhints.com/archive/index.php/t-28650.html

Reset power management unit (PMU) 12" PB Aliminium case

The Apple instructions for resetting the PMU are:
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.
I've followed the instructions and can't get the PMU to reset. (I understand that the date and time resets when the PMU resets thereby giving you an indication that it has been successful).
I must be doing something wrong though the instructions seem quite clear.
Is there a trick that I'm missing?
How long should I hold the'Shift-Control-Option-Power' keys down before I release them?
Grateful for any help or direction.

When you press the correct keys it works a treat. Problem solved.

HT3964 Hi my MacBook is freezing whenever I try to open an application. I have tried resetting the system management controller, however no success. How can I wipe my hardrive and reinstall it again. PS: I no longer have the installation CDs,

Hi my MacBook is freezing whenever I try to open an application. I have tried resetting the system management controller, however no success. How can I wipe my hardrive and reinstall it again. PS: I no longer have the installation CDs, can I download it from Apple?

To get replacement installation disks, call Apple. Have the serial number of your MBP ready and a credit card. There is a fee.
Ciao.

T430s Error in how the Power Manager icon displays in system tray at bottom of screen

The icon for the Power Manager in the Windows system tray in the bottom right area of the screen is cut off. It's basically displaying itself too low on the system bar. Please see picture attached:
Does anyone know how to fix this? I've tried updating to the latest version of Power Manager (v 6.40) but that didn't help. I'm running Windows 7 Professional 64-bit.
Thanks.

Hi, wesaturn
Have you tried updating all other driver updates available for your system, such as the BIOS and video drivers? They can all be found here if not.
Also, how long has this been occurring? And has it ever displayed properly?
Best,
Adam
Did someone help you today? Press the star on the left to thank them with a Kudo!
If you find a post helpful and it answers your question, please mark it as an "Accepted Solution!" This will help the rest of the community with similar issues identify the verified solution and benefit from it.

W500: using the switchable graphics with vista ultimate without the power manager software?

seriously, invest in a new hitachi travelstar 320gb for 49 bucks from that tiger place online and a usb hard drive caddy, pop in your free clonezilla cd and your rescue and recovery problems will be over!
after reading all the problems with that software i figured my data was too valuble to get caught in that mess so for under 75 bucks problem solved and i rid my w500 of that bloatware. even cheaper then ordering the recovery disks from lenovo.
working on getting rid of the rest of the useless software now.
hey question, how do you use the switchable graphics on the w500 with vista ultimate without the power manager software? if you can thats next!!
Moderator note: Question added to subject line for clarity.
Message Edited by Agotthelf on 28-04-2009 08:45 AM

That's because you are asking a T500/W500 question in the Thinkvantage forum. Anyway, the answer to your question is in this thread.
ATI recently started packaging their switchable graphics driver together with their regular Catalyst. So downloading their latest driver Catalyst 9.4 from the ATI/AMD site and then modifying it with the Mobility Modder will allow you to use switchable graphics without the power manager. The little problem is just that the released version of the Mobility Modder stopped working with Catalyst 9.2 and you are on your own getting a modified Modder working on 9.4, see here.
So I decided not to make more work for myself staying on a modded Catalyst 9.1 and for the time being living without switchable graphics.
T500: Vista 32, 2.8GHz, 4GB RAM, 15.4" 1680x1050, 500GB 7200rpm, ATI Radeon HD3650 + Intel 4500MHD. T42: XP, 1.7GHz, 2GB RAM, 14.1" 1024x768, 250GB PATA, ATI Radeon 7500.

How to access the power management option?

I cannot find the power management option in my general settings??? how to find it???

Hmm... have you searched the app store? I don't recall ever seeing such an app, but it might be out there. With the sandboxing that goes on, such an app may be impossible to write, but who knows...

Does resetting the system management controller on a MacBook delete any data, like files and pictures

Does resetting the system management controller on a MacBook delete any data, like files and pictures

No,.
You can see the various steps to fix what ails your Mac here
Step by Step to fix your Mac
I've labeled which ones can certainly erase your data, they are at the bottom and adequatly warned.

Modifing the power management setting

Hi, I'm not able to make changes in the power management prefpane in this sense: I adjust the 2 cursors (it's a macmini with osx 10.6.4) and quit system preferences; but if I reopen the prefpane the setting appears unchanged.
I've looked for .plist to trash but I don't know what file to trash.
Any help? Thanks.

Try the /Library/Preferences/SystemConfiguration/com.apple.powermanagement.plist.

How do I get the power manager settings to take hold? And stay that way?

I want to have my computer awake while on the battery and while I'm driving my car. To reduce distraction, I want to have the lid closed.
In order to make this mode easy to get to, I created a new power plan that has the "lid-closed" event result in "do nothing". Sometimes, this works. Sometimes, the computer goes to sleep. It is exceedingly annoying when the computer goes to sleep because I will get to my destination 45 minutes later and find that the computer didn't do what I wanted.
I've also noticed that the setting for "do nothing" sometimes bleeds over to other power plans. This is also a problem because, under ordinary situations, I would like my computer to behave normally.
Here's a summary of the situation:
1. I've disabled the "apply the settings to all power plans" button.
2. I've created a new power plan called "Logging" that should stay awake when the lid is closed. This power plan will sleep after 65 minutes and hibernate 10 minutes after that (on battery).
3. This plan stays awake sometimes, but not other times. At this instant, sitting in my living room, it refuses to stay awake. Oops, just tried it and now it works (a little consistency here would be nice).
4. As a case example, this morning the computer behaved as expected: I arrived at my destination and it was still away and logging. This afternoon, I woke it up and started logging, closed the lid, and drove off. Upon reaching my destination, I discovered that the computer went to sleep as soon as the lid was closed.
5. The program I'm running logs data points. When the computer sleeps, data points don't get logged. Therefore, I know the computer is sleeping because, after a long logging session (45 minutes), there will only be a few seconds of data points (which correspond to the amount of time it takes to close the lid). If the computer goes to sleep after 10 minutes or 30 minutes, there would be many more data points.
6. When the computer hibernates or sleeps, it seems to remove whatever change I last put into the plan. Even so, the plan still "says" that the change is there.
Ultimately, the difficulty here is that I can't predict what the computer is going to do. If I could, then I could adjust my use pattern.

Try this:
Go into Power Manager, choose the Logging profile.
Go into Windows' Power Options, choose a different profile, then switch back to the Logging profile.
See if this clears any contradiction between the two.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

Query or Report Showing Machines/Users Who Have Opted Out of the Power Management Settings via Software Center

Is there a record in the DB of machines which have been opted out of power management? In other words i want a report of machines that have the tick box for 'Do not apply power settings from my IT department to this computer' in Software Center.
Thank you.

Hmmmm, i should have had a coffee before submitting this question!
The report is a default one:
Home > ConfigMgr_[site_code] > Power Management > Power Management - Computers excluded

Using Power Management Unit

Hi,
We have about 10 PowerBook G3 Firewire computers at our school. They haven't been used in a couple of years and now none of them will start up when I press the power button. I went to Apple's support pages and was told to press the reset button the back, wait 5 seconds and then press the power button. I did this but nothing happened. Does anyone have any suggestions?

While there could be a variety of reasons the PowerBooks do not start up a very common one, especially when the PowerBook has sat idle and unplugged for a long time, is the depletion of the pram battery. For some reason a dead pram battery will prevent the PowerBook from starting.
First try leaving the PowerBook plugged into it's power adapter overnight and see if it starts the following day. If that doesn't work you can take the keyboard off and disconnect the pram battery. A PowerBook G3 Firewire (Pismo) can start and run without the pram battery. It will forget it's time and other settings if you unplug it though.
Here are instructions for disconnecting the pram battery:
http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G3-Pismo-PRAM-Battery/21 /1
Note: You do not have to disconnect the ribbon cable for the keyboard in this process. Just lay the keyboard upside down over the track pad and leave its cable pugged in. Once the keyboard is on the track pad go immediately to step 8 and remove the plug for the pram battery.
Hope this helps

What is the power spectrum unit for Unevenly Sampled Signal Spectrum.vi if the input signal unit is Volts?

The Unevenly Sampled Signal Spectrum.vi has two outputs, Power Spectrum FFT(X) and Power Spectrum FFT(X) Frequency. Can anyone tell me what's the unit for Power Spectrum FFT(X) if the input signal unit is volts. Also, is this VI equivalent to producing a PSD output?

Hi,
The power spectrum will be in units of Vrms^2 which are power units. There is a very usefull VI that you can use to easily transform the units of your spectrum; the VI is called Spectrum Unit Conversion.vi. You select the type of spectrum that you have and the units that you want it to be converted to.
Here is a good document on spectral measurements in genereal:
frequency spectrum
I hope this helps.
Regards,
Juan Carlos
N.I.

Resetting the Power management unit

Similar Messages

Maybe you are looking for