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

Similar Messages

  • 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

  • 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.

  • 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.

  • When using Power Management i get 'no data'

    I'm using all sorts of reports in SCCM and all are working except the power management reports. I get the following message: 'no data'
    The following options are turned on:

    The CM client is installed on every workstation and the resource explorer is populated. Is it possible to force the report instead of waiting +/- 30 days?
    It is still unclear to me if you environment is healthy.
    You say the query above only shows you 1 computer but every computer has the client installed. How many computers do you see listed in “Count operating system versions”?
    For the computer show in the resource explorer screenshot, do you get any results for “Power Management - Computer activity by computer”
     Feb 7 2015?
    Until the data is collected from all of your computers and until you have several days’ worth of data, some reports will not full work. There is no way to hurry it up.
    Garth Jones | My blogs: Enhansoft and
    Old Blog site | Twitter:
    @GarthMJ
    1. Count Operating System Versions:
    Microsoft
    Windows 7 Enterprise
    932
    Microsoft
    Windows 8.1 Enterprise
    1
    Microsoft
    Windows Server 2008 R2 Enterprise
    1
    Microsoft
    Windows XP Professional
    13
    2. For the computer in the screenshot (and other workstations) i get "no Data". When i click onclick for detailed information i get some data like
    the Power Settings Plan.

  • Can't disable auto screen brightness on M92z even after using power manager

    I find the auto screen brightness annoying and have been trying to disable it.  When I go into power manager and turn off "auto" it works, but once I reboot, it's back on again.
    I've gone into the sensor section of power manager and disabled the sensor but that too does not stick.  I've also checked that "magic brightness" setting as well.  Nothing seems to stick after a reboot.  Things work until I reboot.
    I have installed the latest power manager, but 2 things seem strange.  website says latest version is 3.40.0002 but when download and install that version it reports 3.40.0001 (notice the 1 vs the 2).  Also in control panel it says power manager 32 bit but my OS is Windows 7 64 bit.
    Roveer

    Alright, so this is ridiculous. Back to square one with nothing booting. I managed to get it booted up once fully, and another time booted off the OS10.3 disc (froze during disk repair in Disk Utility).
    I don't have another hard drive to try, and I've taken it apart and reset everything.
    Any ideas?

  • 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

  • Noise when using power adapter

    I've got a 1.25Ghz Powerbook 15 inch. It's been pretty noisy lately and sounded like a high pitch type mosquito sound. I just unplugged it to use battery power and the sound stopped. Now it's quiet as it should be. Does anyone know what may be causing this noise?
    Also, what happens when I reset the power management on a powerbook? Do I lose any settings?

    I had the same irritating 'mosquito' buzzing sound when plugged into my new 65 W AC power adapter (my previous one died) and the charging was intermittent and would require plugging & unplugging to get it to start charging again. I reset the PMU (power management unit) -- see BGreg's link above -- and it now working well. I hope it works for you!
    cheers

  • IBook won't power on... power management issues?

    Hey everyone,
    _MY SYSTEM_
    I've got a 12" iBook G4 (1.33 GHz) running 10.4.10 that's about a year and a half old. It's been a great computer for me, and I've used it on an almost daily basis since I first got it. Its experienced a few power-related quirks within the last month or so, however. I can't think of any event that would've caused them.
    _THE SYMPTOMS_
    I first started noticing that OS X sometimes displayed the low battery warning at odd times or not at all. I didn't think much of it... figured it could be my power adapter coming unplugged or something. Then I started noticing decreased battery life, but I chalked it up to the effect of fairly heavy use and lots of charge cycles. I continued to feel like my power adapter was getting progressively more finicky... it started requiring much closer contact with my iBook than it used to, but since it's a friction fit, I figured the contact was just getting looser.
    _CURRENT STATUS_
    When I turned the computer on this morning and plugged in the charger the status bar icon didn't seem to recognize it as attached to the adapter. The colored ring around the connection point would go green when connected, but never turn amber. So I used it today until it went to sleep on me. Tried plugging the adapter in, but the same issue existed... the ring would turn green but never amber and the iBook wouldn't actually charge.
    TROUBLESHOOTING
    I first tried another adapter with no luck. I was able to use the power button to shut my iBook down with the intent to reset the power management unit on startup. That key combo didn't even produce a startup, it just killed the adapter's indicator light for a brief moment. Unfortunately the battery seemed too depleted to start the computer back up. I tried zapping the pram, and that got me to the login screen before the computer recognized it was low on power and went back to sleep.
    SUMMARY
    As far as I can tell, the computer isn't recognizing either adapter when one is attached. The battery doesn't seem to be the issue. My iBook is completely unresponsive without the battery (only on AC power), and doesn't charge the battery when both are connected. Anyone have suggestions for me before I make the trek to the nearest Apple store?
    Thanks,
    Matt

    If the power adapter seems looser when you plug it in, you might have a problem with your DC In Board. This is what the power adapter plugs into, and it can become damaged.
    You can go to http://www.ifixit.com/ and look up the DC In Board for your iBook and see what it might take to fix it yourself. If you go to the Apple Store, have them take a look at it.
    Good luck!

  • Windows vs thinkpad power manager

    hi,
    as one can see, power adjustments can be made in 'thinkpad power manager' but also in windows itself (configurationmanagement) : what is preferrable ? since i and many others experience the fan noise problem ; and is it so that configuring in Windows AND in thinkpad PM gives a conflict ??

    http://www.staff.uni-marburg.de/~schmitzr/donate.html
    For years the only Thinkvantage program I used was Hotkeys.  I always used windows wireless, windows power manager and everything else windows.  I always figured there would be conflicts between the different power managers just like you're wondering.  
    I started using Power Manager about a year ago and the more I use it, the better I like it.  I do adjust my windows power settings to match my power manager settings because I still think that if the settings are too far apart there could still be conflicts.  Make sure any power settings in the bios are changed to match.  I haven't had any problems with xp, vista, 7 home premium, 7 professional or 7 ultimate.  It's real easy to make power profiles and switch between them with power manager. 
    I still like windows 7 network manager better than access connections, but I think that is only because I haven't yet figured out all the aspects of access connections. 
    So, I guess I can say that I like Power Manager.
    As far as fan noise goes, I assume you mean the noise when the fan runs fast.  Laptops are getting faster and faster and people are opening many windows, watching 3 movies at once, a monitor and a tv going.  That equates to heat.  More heat faster fan.  If the fan didn't run, the laptop would burn up.  After 3 to 6 months the fan gets dust caked on it the intake for the fan gets stuff sucked up in it and the discharge vent gets stuff stuck on the back of it.  No one wants to clean it. So the fan gets fast and the laptop gets hot. 
    TPfancontrol is a good way to control the fan and know what temps are in your machine. You can configure it how you want. It's been the standard fan control for thinkpads for a long time now, I wish I had something like it for my hp's.
    Dave
    T430u, x301, x200T, x61T, x61, x32, x41T, x40, U160, ThinkPad Tablet 1838-22R, Z500 touch, Yoga Tab 2 Windows 8.1, Yoga Tablet 3 Pro
    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"!
    If someone helped you today, pay it forward. Help Someone Else!
    English Community   Deutsche Community   Comunidad en Español   Русскоязычное Сообщество

  • Power-manager applet: wrong alerts

    I have Gnome and I use power-manager-applet in the taskbar to check the life of the battery.
    I noticed this strange problem... When I use the laptop with batteris and I connect the power cable, the applet displays a popup alerting me that the power cable has been disconnected! But the icon shows the right image with the plug over the battery. And if I put the mouse on it, a tooltip says that the battery is charging...
    If I disconnect the cable, the applet doesn't display no alters and an OSD popup with a stylized gear appears in the middle-botton of the monitor....
    Does anybody has experienced something similar?

    I've tried xfce4-power-manager but this program has a bug too.
    Its icon appears in the sys-tray only after about 20 seconds after Gnome's loaded...
    I've tried to load it from ~/.bashrc but it manifest the same problem: it appears only after a while... Could it do this because I use it under Gnome instead of XFCE?
    P.S.:
    I've noticed that it is also slower than gnome-power-manager in refreshing its state: if I disconnect the power cable, it pops up the notification after 5-10 seconds...
    Last edited by leo72 (2009-06-30 20:26:22)

  • Where is power manager for FW 800 G4?

    I can't seem to find the location of teh power management unit for the G4 FW 800 dual 1.42. Any reference material would be greatly appreciated.

    The PMU moves around on various motherboards and within one class (there are at least 3 each variants of the 133 and 167 motherboards for Mirror Door Computers!)
    The button is usually located in the center of a silvery box about 3/8" square and has a red button. They are usually close to the battery and usually say in microscopic print "pmu".
    For the exact location go here
    http://www.whoopis.com/computer_repair/#new
    Download the manual for your mac, go to Views and the picture of your motherboard with the pmu location diagrammed.

  • T61 Power Management Driver for Windows 7 - where?

    I cannot find a released Power Management Driver for Windows 7 for the Thinkpad T61.
    I see a version 1.60 but it does not include Windows 7 for the T61.  And the only other one I have found is beta.
    As an aside, do I even need the Power Management Driver if I'm not going to use Power Manager?

    Right there in the T61 drivers and software dowload page:  "Support -> Download Drivers and Software -> enter T61"
    ThinkPad Power Management Driver
    README for ThinkPad Power Management Driver
    In the driver matrix, it's listed as for "ACPI Power Management" for Vista and lower - but is the same driver. The readme and download page include Win 7 if you dig a little deeper.  Maybe that's what is causing the confustion.
    [edit] Sorry, spoke too soon.  I dug a little deeper.  The readme doesn't list the T61 under WIn 7, only Vista.  OTOH, the download page for the T61 lists that driver for Win 7.  Anyone actually try it?
    Z.
    The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.  The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
    English Community   Deutsche Community   Comunidad en Español   Русскоязычное Сообщество

  • Power Manager 7.40 - installed, working fine, lost it after format

    So I don't really know how, I'm guessing it was installed either by an older Settings Dependency package or something, but I had Power Manager version 7.40 installed on my X220 with Windows 8 Pro.
    It worked pretty much perfectly, no crashes etc.
    I decided to make a fresh install of Windows 8 so that I can try 8.1.
    Sadly it appears Power Manager cannot be officially installed on Windows 8.
    The last version for Windows 7 is 6.5. I'm wondering - is there somewhere where we can download version 7.4 which I know for a fact worked fine with Windows 8?

    Power Manager is not supported on Windows 8.
    The 7.xx version thing is a side-effect of the following:
    - forcing Power Manager 6.xx to install on Win8 by using "compatibility mode"
    - upgrading your Win7 system with Power Manager, to Win8
    ... and then installing the Lenovo Settings Dependency Package.
    The Lenovo Settings Dependency Package updates binaries that are also used by Power Manager, this is where the 7.xx thing comes from.  There really isn't any Power Manager 7.xx
    I do not recommend using Power Manager on Windows 8, it is not supported and has never been tested on Win8.  Besdies this many users report problems from forcing Power Manager to install on Win8.

  • Power Manager Odd Behavior

    I'm using Power Manager 1.6, and I run into this strange behavior when I trying to create a new power profile with the following settings:
    On battery:
    CPU: Low
    Fan: Balance
    Display: 5
    Brightness: Never
    Display off: 5
    HD off: 3
    Standby: 1 hr
    Hibernation: 2 hr
    On AC:
    CPU: Adaptive
    Fan: Max perf
    Display: 5
    Brightness: Never
    Display off: 15
    HD off: 10
    Standby: Never
    Hibernation: Never
    Yet power usage gauge indicates that the On battery setting is using more power than On AC (4 vs 3).  Is this right?

    Hi,
    yes, that seems strange. 
    I have tested this on my X301 and it changes the state directly after I lower the Display brightness. 
    btw: I'm using 16 lines of configuration, and that is why this is wokring fine when I change it only in one point.
    Based on your screenshot you are using 8 lines of configuration by the Display brightness. 
    I would not see this as an real issue. 
     However, I'll double check it and will let you know. 
    Rgrds

Maybe you are looking for