Start up requires PMU reset if battery dies and charger is attached.

I use my PowerBook sometimes without the charger attached in class or just around the house until the computer gets to the point of putting itself to sleep because the battery has no more charge. I attach the charger and it has the amber charging glow but I cannot restart the computer unless I reset the PMU which fixes the problem right away. Is this a problem, should I be concerned with resetting the PMU so often? Is there anyway to fix such a problem, does it have something to do with the battery's age, over 350 cycles? Its more of a nuisance than anything, but if there is a greater problem that will rear its head soon, I would like to know about it, such as a logic board issue. If anyone could give some insight, it would be greatly appreciated.
Thank You
Nick

We are having exactly the exact same problems with our G4, 2-yr old, Power Book. It won't start and the USB ports don't work, But so far the only way we can start it (on occasion) is to remove the battery, place computer in the refrigerator for at least 10 minutes, remove, reset the PRM, replace the battery, and then start. This is very inconvenient, and quite frankly its taken hours of work getting it from a total no start mode to the start mode with the technique mentioned above. Judging from the discussion board this is not uncommon. If anyone can shed some light on this issue we would really appreciate it. Thanks so much!

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2008 early macbook pro battery normal and charging but stays at 0% Won't charge.
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Do I need new battery or is it a hardware issue?
Model Information:
Serial Number:          ˇ
Manufacturer:          SMP
Device Name:          ASMB012
Pack Lot Code:          4
PCB Lot Code:          0
Firmware Version:          0dc0
Hardware Revision:          0
Cell Revision:          0
Charge Information:
Charge Remaining (mAh):          0
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Charging:          Yes
Full Charge Capacity (mAh):          4008
Health Information:
Cycle Count:          125
Condition:          Normal
Battery Installed:          Yes
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Voltage (mV):          8459
Message was edited by: mcj2112

Reset the SMC > http://support.apple.com/kb/HT3964
It's clear that the battery has got enough capacity to work correctly, so something happens with the MagSafe port or its charger. If you have another charger, try it, and if not, take the MacBook and the charger to an Apple Store or reseller. It's better to do this as we don't know if the problem is in the charger or in the MacBook Pro

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Why does my iSight camera periodically stop working, requiring PMU reset?

Just wondering why this happens?
Using a Feb 2011 Macbook Pro with OSX Lion 10.7.4
It seems that every time i use my built-in iSight camera, then the next time i go to use it, it can not be found. This requires that I reset the PMU, which is kind of annoying. Then it works for a few weeks and the cycle of iSight begins again.
Why does this happen? It seems pretty trivial to consistently recognize a camera which is wired into my computer. Is there something I could do to prevent this from happening again? I have tried turning it on and off again.
And currently, this article is linking to the reset instructions for Intel iMac instead of the Macbook Pro page...
http://support.apple.com/kb/HT2090
Thank you

dcunited001 wrote: ... Just wondering why this happens? ...
Because something is wrong.
dcunited001 wrote: ... Is there something I could do to prevent this from happening again? ...
One of the following will fix it.
(0) If you need help with the following suggestions,
      you might rather contact your local retailer or
      Apple Authorized Service Provider (AASP) for help.
      They can help you or determine whether your Mac
      needs hardware service or only a software problem.
(1) Close all open apps that use the camera and then
     try again with only one app running at a time.
     If the problem continues, delete any Log-In items and
     Dashboard Widgets that might be using your camera.
(2) Try Apple's http://support.apple.com/kb/HT2090
     Be sure to use the correct SMC/PMU reset procedure
     for your particular MBP model: model with a battery
     you should not remove on your own
     If these suggestions do not help, yours may be a
     hardware problem that will require a professional fix.
    Unless you have a current backup, make one now.
    Then use the final "Troubleshooting" suggestion:
"... contact Apple or an Apple-Authorized Service Provider for service."
(3) If you want to try one more thing on your own first,
     you can use Disk Utility to repair permissions. Then
     download and apply the latest Lion Combo Update:
      http://support.apple.com/kb/DL1524
    Repair permissions again immediately following the
    system restart that completes the Combo update.
Properly applying the Combo version of updates can sometimes correct software problems, but, if your trouble is caused by a hardware problem, there are no user serviceable parts of iSight. See your AASP for hardware problems.
dcunited001 wrote: ... article is linking to the reset instructions for Intel iMac instead of the Macbook Pro page...
The article actually has THREE links to TWO different SMU/PMU reset instructions:
• iMac G5 (iSight),
• Intel-based iMacs;
• MacBook and MacBook Pro
You should use the last one ( http://support.apple.com/kb/HT3964 ) Yes, it is the same article as for iNtel-based iMacs, but it is the correct one for you.
The important thing is to page down to the section entitled "Resetting the System Management Controller (SMC)".   Then click the reveal triangle ( ▶ ) to see and carefully follow the specific reset instructions for "Resetting the SMC on portables with a battery you should not remove on your own". This is the proper reset process for your "Feb 2011 Macbook Pro".
Message was edited by: EZ Jim
Mac OSX 10.7.4

T400 system time resets when battery dies

Anyone else having this issue? I've had it on many of our T400's here. If the user allows the battery to completely run out without shutting the laptop down, it will kill the bios battery too and reset the system date and time.

I have had this problem with other laptops as well..
I am guessing the problem is with the cmos battery on the motherboard and not the main system battery,
Whwn the system is shut down or the main battery dies, the cmos battery is the one that saves the time and keeps it updated.
Also its the cmos battery that powers the bios during system startup.
If you need to reset the time every time you start up the system , thats the first indication that the cmos battery is dying.

Computer wont start - did the PMU RESET - will turn on without monitor

PROBLEM :
I have done a search....about 30 pages....read thru approx 70 posts and external links....really need HELP. PLEASE.
I just moved recently. Shut down the computer (but did not park the drives). 48 hours later, I set up my powermac quicksilver G4 - and it will not turn on.
WHAT I HAVE TRIED :
Zapped the PMU - 5 seconds, then the power button for 5 seconds with the cables all removed.... nothing
Zapped the PMU - 5 secs and powerbutton 5 seconds with the battery removed
and the computer would go on ONLY WITHOUT the monitor being attached....as soon as I plug the monitor cable back in, it shuts down immediately (as if someone pulled the plug)
Zapped the NVRAM next
Zapped the PMU again
Took the battery to Radio Shack - it read 3.71 (so it is good)
QUESTION :
Does anyone know what I can do? Please....and suggestions!
TIA

I have Apple Remote Desktop (which may or may not change the playing field)and I am able to login in with my laptop, and shutdown etc....
I just tried this.... to see if there was anything I could do remotely.
--> Is there something that can check the video card that I can run on my computer remotely?
I FOUND ANOTHER THREAD with a user with the same problem....is there anyway to contact this person to see what was done to solve the problem?
http://discussions.apple.com/thread.jspa?messageID=2843560&#2843560

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MacBook Info:
Mac OS X
Version 10.6.4
processor 2.4 Ghz Intel Core 2 Duo
Memory 2GB
Battery Information:
Model Information:
Manufacturer: DP
Device name: ASMB016
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0102
Charge Information:
Charge remaining (mAh): 735
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 4599
Health Information:
Cycle count: 547
Condition: Normal
Battery Installed: Yes
Amperage (mA): 2017
Voltage (mV): 11473
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: Yes
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Current Power Source: Yes
Display Sleep Uses Dim: Yes
Battery Power:
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Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
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This might be a different problem, but I just recalibrated my battery for my Macbook Pro 2.4 GHz Intel Core 2 Duo (bought it it '07, replaced the battery once already). The battery life is actually worse now than before I recalibrated the battery. In fact, it turns itself off after a few minutes and I have to restart it, and the battery power is still reading 64%.
The cycle count in my system profiler reads 152, condition "good".
Charge Information:
Charge remaining (mAh): 3132
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 4564
Health Information:
Cycle count: 152
Condition: Good
Battery Installed: Yes
Amperage (mA): 2475
Voltage (mV): 12278

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I've tried restarting it. When the battery finally dies and I get to turn it back on, it works for a while until it freezes, then I click the power button to put it on standby and then the screen won't turn back on but the computer says it's still on. However, the computer won't detect the device.

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I am currently using a PB G4 15" (high res DL SD) and I've had it for about a month. I just read about calibrating the battery and went ahead and did it. Have I done any damage to the battery or shortened it's effectiveness by waiting a month to calibrate rather than when it was first out of the box?
Also, i also just read about checking the battery charge capacity using the system profiler. My charge capacity prior to calibration was 2731 and after calibration it's 2930. However, it sounds like it should be in the 4400's based on the posts I've read. What do these numbers mean and do I have a faulty battery since it's so low?
Thanks for your help.

Hi Kevin --
Yeah, I'm not loving those numbers you posted either. I'd try performing the calibration procedure once or twice more to make sure that that battery capacity number doesn't change.
The other thing I would do if I were you is download Coconutbattery: http://www.versiontracker.com/dyn/moreinfo/macosx/27425
It's a free app available at versiontracker and it will tell you your battery's original capacity as well as it's current capacity.
I agree with you that a capacity of 2930 mAh after only a month of use and 16 cycles suggests that your battery is defective and should be replaced at no cost to you under the terms of the warranty.
For a frame of reference, after 10 months of use and 166 load cycles, my battery's original capacity of 4400 mAh is now 4228 mAh. No way yours should be in the 2930 mAh range.
When you call AppleCare to arrange for a replacement, if in fact that's what you end up needing to do, the agent you speak with, in addition to making sure that you've properly calibrated your battery a few times (as mentioned earlier) may also ask that you reset your PB's Power Management Unit (PMU). While I'm skeptical that a PMU reset will alter the outcome, you can find instructions on how to reset the PMU here (just in case you need to): http://docs.info.apple.com/article.html?artnum=14449
Good luck and please post back how everything turns out.
-- JDee
PS. You probably know this, but the calibration procedure has been changed slightly for your DL hi-res version of the PB. Here it is below, just to make sure:
PowerBook G4 (15-inch Double-Layer SD)
The battery calibration for the PowerBook G4 (15-inch Double-Layer SD) has been updated because of a new battery released with this computer. With these computers, follow these steps to calibrate your battery:
Plug in the power adapter and fully charge your PowerBook's battery until the light ring on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged.
Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in.
Disconnect the power adapter with the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, you will see the low battery warning dialog on the screen.
Continue to keep your computer on until it goes to sleep. Save all your work and close all applications when the battery gets very low, before the computer goes to sleep.
Turn off the computer or allow it to sleep for five hours or more.
Connect the power adapter and leave it connected until the battery is fully charged again.
Tip: When the battery reaches "empty", the computer is forced into sleep mode. The battery actually keeps back a reserve beyond "empty", to maintain the computer in sleep for a period of time. Once the battery is truly exhausted, the computer is forced to shut down. At this point, with the safe sleep function introduced in the PowerBook G4 (15-inch Double-Layer SD) computers, the computer's memory contents have been saved to the hard drive. When power is restored, the computer returns itself to its pre-sleep state using the safe sleep image on the hard drive.
Message was edited by: JDee

HP Pavilion battery healthy and charged but laptop is not running on battery

A serious and odd problem has developed with my Pavilion (HP 15-N096EA PC)
I removed the battery when the machine was switched off and pressed the start button as this procedure was suggested on a site for clearing malware issues.
Since then, my laptop has refused to run on battery. Behaves as if there was no battery in it. The Pavilion is relatively new, the battery is in perfect condition, charges to 100% and keeps the machine running for up to 6-8 (!) hours. Not kidding.
Even now, the mains connection charges the battery, the little icon says so in the system tray. It is now 100% charged.
But when I unplug the mains adaptor the whole thing dies immediately.
I applied electric contact cleaning liquid to the connection ends of the battery, even measured the voltage in the battery with the tipped ends of a volt meter. All reading perfect values, yet the computer has stopped working from battery.
An hour ago this computer worked completely well on battery, but since the current "draining" exercise absolutely nothing. Tried all sorts of options: Taking battery in and out while on mains, nothing doing. If I am correct, battery calibration can only happen with the computer running on battery and this computer refuses to run on any battery.
What has happened here please? ANY HINT,ADVICE, SUGGESTION from professionals, non-professionals most desired and appreciated. Thanks.

Hi @Squinancy
Welcome to the HP Support Forums!
From your description it sounds like you were try to do a hard reset of your notebook to start with, but it is possible it was not done properly. Read through this, and try it again.
HP Notebook PCs - Use Hard Reset to Resolve Hardware and Software Issues
If after that the computer is still not booting up on battery, check through this one next.
Battery does not power the notebook or hold a charge
Let me know how it works for you, and if you have more trouble please post any other details you can.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

Powerbook won't run off of battery - requires PMU reset to power up with AC

Like everyone else posting here, my powerbook won't run from the battery. I have two batteries, one that came with the computer 3 - 4 years ago and a newer one that I purchased about 1 year ago. When I am plugged into AC using iStat Nano the newer battery shows cycles 173, health 89%. The older battery show cycles 0 and health 100% (go figure!). Both batteries just say 'calculating' on the tool bar battery meter. The light around the AC adapter plug always shows green as if the batteries are fully charged.
Here is where my post differs from the others. Once I shut down the computer I can't power it up again with reseting the PMU. I've tried reseting NVRAM and deleting and re-establishing the powermanagement plist as suggested elsewhere on this forum to no avail.
Is the PMU something that can be replaced? How is it related to DC-IN? I've read elsewhere here that is another problem that could cause these symptoms. Has anyone had these two components repaired and did it fix the problem? How much did it cost?
Thanks in advance for any information you can give men.

I had the same experience. I have 10.4.10 on the cloned drive but the battery is still not charging. I decided to take a closer look at the battery updater instructions and discovered that even though I am at 10.4.11 on my Powerbook the BatteryUpdater.bundle was at revision 1.1.3 and hadn't been updated since Jan 6, 2006. So I downloaded the BatteryUpdate that is posted at the top of this forum and installed it. It has made no difference in the operation of the computer. The AC adapter still isn't charging the battery although the green ring light is on which usually indicates the battery is charged. furthermore, when I go back and look at the date and version number on the BatteryUpdater.bundle they haven't changed. Who knows what the update actually changed! There is no mention of it running in the software update log. My system profiler says:
The battery is installed
Full charge Capacity 3890
Remaining Capacity 0
Cycle Count 173
AC adapter cannot charge battery: YES
By the way, my battery is a replacement battery.
I have just about exhausted all my option other than taking it into an Apple repair store and I'm not sure at this point I want to give Apple any more of my money. I am going to live with it the way it is for a while in the hopes that someone will post a fix for the problem. Good luck with your investigation. If you find out anything else please post it here as I will check back on a regular basis. If I find out anything else I will do the same. Nice working with you.

Battery Capacity And Charging

My MBP's battery has an original battery capacity of 6300mAh.
When fully charged its capacity is at just under 6800mAh.
I guess this would be considered overcharging; could this cause problems of any kind?

My replacement battery started with just under 6800 mAh, and over time drifted downward (which is normal) then stabilized (at around 91% health ±5%, where it's remained since about cycle 30). While it's above 6300 mAh, iStat and CoconutBattery will report health as 100%.
As Kappy stated, the 6300 mAh value (rounded up from 6296 mAh, actually) is a nominal value, calculated from the wattage and voltage specifications of the battery. Individual batteries will vary, with many initially exceeding that calculated value.
Bottom line, what you're seeing is normal and nothing to worry about.

Start up requires PMU reset if battery dies and charger is attached.

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