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

Similar Messages

  • 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.

  • 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
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  • 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.
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  • How do I reset the 940 ink cartridge chip on Officejet Pro 8500 Premier?

    I have refilled my 940 ink cartridge and now I can't get my printer to print. I get the error message that I do not have enough ink to ensure printer health. My ink is full. 

    Hi sparkplugYou could maybe try resetting the printer...http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02005923&cc=us&lc=en&dlc=en&product=3752456&tmp_track_link=ot_search  Note though, as BikerMike has already pointed out,  refills tend to not to have the same reliability as originals...http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00853819&cc=us&dlc=en&lc=en&jumpid=reg_R1002_US...  Kind Regards, Ciara

  • How do I rename the 2 optical drives in a mac pro

    On the Mac Pro (OSX 10.6.8), using Toast to copy a CD, I often find that the "read" phase assumes I am going to "write" to a disc in the same Superdrive, even though there are two of them. The superdrives both have identical names, so selecting the drive is guesswork.
    I've tried quite a few searches on both the Apple forums & Google, to find out if it's possible to rename these two drives (ie, in the same way that Windows allocates a drive letter to each).

    Nope.
    Once upon a time when ATA busses offered Master and Slave settings you could set one as Master, and Toast would automatically show that as the first optical drive on the list. It all went away once they went to cable select settings on the ATA.
    I had/have the SAME issue and it got so thoroughly frustrating that I pulled one of the super-drives, (Pioneer DVR-112) installed it in an external case and stuffed a used $5 DVD-rom drive from Goodwill in the second slot.
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  • How can I enable the GPU option on a new mac pro with 2 AMD D700 graphic cards?

    I have recently purchased the new mac pro and I saw the GPU option is not enable and only recognizes the CPU one, what is frustrating. Does anybody know how to enable the GPU option?
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    See this for details of how the GPU is used in After Effects:
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    Note that your card will be used for all of the GPU acceleration features but one---the ray-traced 3D renderer---which requires an Nvidia GPU. That is an obsolete feature that you don't need to worry about, anyway. There are many better alternatives to using 3D in After Effects, including Cinema 4D, which is now included with After Effects:
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  • 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.

  • 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...

  • S750 - How many people get the power on/off/resetting issue?

    How many people get the power on/off/resetting issue?
    I've had my S750s for about 6 months, with X-Fi Elite Pro, and has been doing it since.
    Any idea on what's the cause? Something to do with the control pod?
    Thanks.

    Hi,
    What do you mean exactly? On my side I have power on/off/resetting issue when the speaker are in standby mode (thus red light on the control pod) and when I switch them on via the remote control or the control pod. It makes a strange noise in the subwoofer ("clic"), the red light disappear, then a new noise and the speakers are switched on. The problem is that all volume levels (rear / side / center / sub and main) are reinitialized! I have to configure them each time this problem appears...
    I have a Creative Sound Blaster Audigy 2 ZS connected to this speaker system. For me it is related to an electrical problem in the subwoofer like if the voltage was not stable (variations).
    Regards,
    Vincent

  • HT1212 I have an ipod 4 touch with a broken power button and Im locked out of the ipod. How can I reset the ipod? Please help!

    I have an ipod 4 touch with a broken power button and Im locked out of the ipod. How can I reset the ipod? Please help!
    I also don't know the operating system.

    See the method in my reply in this discussion for how to place the iPod in Recovery mode w/o buttons
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  • Can't Open File Explorer -- How can I reset the Quick Access Toolbar from outside of File Explorer?

    First of all, this is not a virus. This is my a bug within windows explorer itself.
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    to me. So, I hovered over it, right-clicked on "Properties" in this menu and added it to the QAT. Of course, this crashes File Explorer. Now whenever I try and open it, it crashes, so I have to assume that the corrupted button has been saved.
    So, my question is: How do I reset the QAT from OUTSIDE of file explorer? Regedit magic? Any ideas?
    Thanks for stopping by,
    Trolleyman.
    Edit: Just so you know, I can navigate through my systems files using the 7-zip file manager. Phew.

    Thanks from me  too, Niki. This first happened with Windows 8.0 File Manager a week ago,, and despite much research I couldn't  discover the cause so eventually I resorted to restoring  the system drive from backup (luckily I make daily backups, 
    so didn't lose   much  work).
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    luckily while doing a bit more research prior to resorting to the same drastic recovery, I cane  across this post  of yours and it worked!
    It doesn't  seem  to be  happening with Office 2007's   or  Wordpad's  Quick Access Toolbar,  so presumably it's a File Explorer bug  (a.k.a. Windows Explorer in Windows 7, of course). Have Microsoft recorded this as
    a  bug -- if not,  why not  -- and when  are they coming up with a fix?

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