Procedure - reset PMU on XServe G4

Hi,
Can someone provide instructions, or link to instructions, for resetting the PMU on an XServe G4 1333mhz? My unit is shutting off with PMU error code 122. TIA

Donald, you need to scroll down and click on the link the starts with:
iBook (16 VRAM), iBook (14.1 LCD 16 VRAM), iBook (14.1 LCD 32 VRAM),
That will take you the the following (FAQ#6):
For iBook (16 VRAM) and later models of iBook, there is no physical reset button.
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 iBook computer.
John

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Reset PMU Xserve

Got an XServe intel version. Trying to reset the PMU as the fans have gone crazy. Had an engineer look at it, given the all clear but the instructions we've found are not at all clear and don't actually make sense.
*+1. In order to enter the headless command mode, hold the identifier button while you power the Xserve on.+*
*+2. Keep pressing the identifier until you see the top row of blue lights on the Xserve blinking.+*
*+3. Stop pressing the identifier button. You'll notice that the right-most blue LED on the bottom row is lit up - this indicates that the system will start from the system disk.+*
*+4. At this point you can press the system identifier button in order to cycle through the boot options. They are as follows (right to left)+*
*+- System Disk+*
*+- Network Boot+*
*+- Start from leftmost drive+*
*+- Boot next disk (other than startup disk)+*
*+- Target Boot Mode+*
*+- Reset PMU+*
*+5. Release the button once again and the system will boot into your desired mode.+*
We can get it to the 4th step and light up the PMU reset light but we would have already released the button to select that option! It then just sists there and doesn't reboot. If you power down and restart it starts normally again!
Any ideas? (Can't reset on MB as we can't access the server without serious surgery in the cabinet, it's not on rails)
Thanks.

Hey Ken,
If you are looking to reset the pram or nvram you can do so with sever monitor on a remote machine.
In server monitor you can click on the restart button and then select "on the next restart" Reset NVRAM and then select the first bootable drive.
It sounds more the like the system management controller is what you are looking for though as it controls the fans.
Follow these instructions for tha
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.

ISight camera can't be recognized. Do I have to reset PMU?

Can anyone help me...?

nieyihemu wrote: ... iSight camera can't be recognized. Do I have to reset PMU？
Perhaps.
• If you have not already done so, restart Mac and
    try again. If the iSight still does not work, continue.
• If Apple's http://support.apple.com/kb/HT2090
   suggestions do not help you, (be certain that you
   use the correct PMU/SMC "reset" procedure for your
   Mac model), yours may be a hardware problem
   that will require a professional fix.
• Test more than one Apple app in more than one
   user account. If the problem persists with all,
   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."
• If you want to try one more thing on your own first,
use Disk Utility to repair permissions. Then
download and apply the latest Combo Update for
your OS. Currently, the latest SL Combo is here:
    http://support.apple.com/kb/DL1399
• 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 so see your AASP if the Troubleshooting suggestions don't work.
Message was edited by: EZ Jim
Mac OSX 10.7.4

After I reset PMU, my power light turns on ... but nothing else

My computer was shutting down today intermittently
actually it has been doing this for a month now, on and off
so today I opened it up and thought I was doing the right thing by pushing that reset PMU button
but now when I plug it back in
the power light is bright but wont do anything else
even when I hold it down
it wont power off like it should
any thoughts here ?

That button should be pressed as part of procedure in these two documents.
http://support.apple.com/kb/HT1436
http://support.apple.com/kb/HT1939
There are two because I don't know which model Power Mac G5 you have. If you have the earlier model and did not unplug everything when you pressed the button last time, I think that is an important part of the procedure. Since you already pressed the button once, you may want to use the alternate method of disconnecting everything and leaving it unpowered for a few minutes before reconnecting. When you reconnect the power, initially connect just the keyboard and mouse (leave the other peripherals off) when you try to start it up.

I NEED TO RESET PMU & RESET PRAM...HOW??

hello all...i was on the phone with applecare and i was told i have to reset pmu and rest pram...somehow last night i lost safari, deleted it, and tryed to download again and when i tryed it said "you can not install safari 1.2 on this volume. This system can not use this software"...i am new to apple so i have no idea what i'm doing..anyones help would be GREATLY appreciated!
thanks!

Hi,
Safari 1.2 is for OS X 10.3 (the previous version of the operating system according to your profile). If you are using 10.4.2, try installing the 10.4.2 combo update which should re-update your Safari to the correct version.

Blue screen, reset pmu, booted up, now no cursor

hello all...i have received a ibook g4 with some issues. i rebooted it, terminal blue screen, decided to reset pmu, came up after power up, and now no cursor. i tried to plug in a mouse. still nothing! any ideas? just trying to get the ibook back up to get the hard drive emptied off. thanks in advance.

Hi.
Two things to try for starters:
First , try a Starting up in Safe Mode
Safe Boot takes longer than normal startup
What is Safe Boot, Safe Mode.
Then re-boot normally.
If the above doesn't fix things so that you can "...get the ibook back up to get the hard drive emptied off" try booting into Target Disk Mode by holding the 'T' key down at start-up and connect it to your Pro with a firewire cable. The iBook's HD should show on the Pro. Run DU from the Pro to erase the iBook's HD. Use the zero out option (once will be enough) to map out any bad blocks. If you are re-installing you can run the install from the Pro too while the iBook is still in TDM.
Have fun,
Adrian

Reset PMU worked.... but....

The screen has darkened again. I will try resetting PMU again, however, I am concerned that at some point this won't work.
How do I determine the cause of my monitor going dark (hard drive is running but monitor remains dark)? This computer suits our needs just fine, so I'd like to keep it going as long as possible.
If fixing is cost-prohibitive, can we hook it up to an external monitor?

Unfortunately the troubleshooting in the Apple Service Manual is basically willy-nilly board changing until it works. I don't even think Apple is sure what the cause is and I believe the problems and expense of fixing was a driving factor for the iMac G5 not having such a complex neck arrangement.
You can connect an external display.
For a 700/800MHz iMac you can connect a VGA display of either 1024x768 (15" iMac G4 models) or 1440x900 (17" iMac G4 models) other resolution displays are not recommended as Apple crippled the video card.
For a 1GHz, 1.25GHz iMac you can connect either a VGA display or any video device (like a TV) via S-Video or Composite Video. Again 15" iMacs should have 1024x768 external display, 17" iMac G4s a 1440x900 external display or 20" iMac G4s a 1680x1050 external display.
There is a hack to remove Apple's deliberate crippling of the graphics, but it is risky (although I've never heard of a failure). This would allow an external display of pretty much any resolution up to about 23"/24" models.
iMac G4 (Flat Panel) 1GHz/1.25GHz:
Mini VGA - VGA
Mini VGA - Composite/S-Video
iMac G4 (Flat Panel) 700/800MHz models:
Mini VGA - VGA
mrtotes

Reset PMU... mouse still stuck..now what?

Hi,
I fixed logic board problem and graphics
Tried to fix mouse by resetting PMU
Now the computer (when you start it) grey screen with apple comes up and locks when the whell at the bottom comes up. Any suggestions?

I'm wondering if you inadvertently disconnected the trackpad somehow? Is it still not working? If it isn't, here is a link to Michael Baker's detailed instructions on how to reconnect it (in case that is the problem):
http://discussions.apple.com/thread.jspa?messageID=1034519#1034519
Does it work okay with a USB mouse?
Will it start up from the Panther Install CD by putting the Install CD into the tray and holding down the c key at the end of the startup chime? If so, then choose Installer > Open Disk Utility and select the hard drive in the left column. Choose the First Aid tab. Click Repair Disk to test and repair the hard drive.
Once you have repaired the hard drive with the Install disc's Disk Utility, then try to start up normally and repair permissions from Disk Utility in the Utilities folder on the hard drive.

My mac mini only shows a steady power light and fan noise when powered up. No video or sound and no commumication with wired keyboard or optical mouse. Tried replacing internal battery and resetting PMU/SMC but nothing seemed to happen. Any suggestions?

My mac mini only shows a steady power light and fan noise when powered up. No video or sound and no commumication with wired keyboard or optical mouse. Tried replacing internal battery and resetting PMU/SMC but nothing seemed to happen. Any suggestions? Many thanks! Richard

You've already done the two things I would have suggested.
If your Mini has an internal battery then I assume it's a G4. That means you've gotten a lot of good years of service from it, and it's old enough that it's certainly not covered by AppleCare anymore, and it's probably not worth spending money trying to repair it.
You should be able to tear it apart using instructions from ifixit.com to get the hard drive out, and then put the hard drive into a nice USB or FireWire enclosure (I like the ones from Other World Computing, macsales.com) so you can transfer your data to a replacement Mac.
I hope someone has another suggestion for you.

Resetting PMU, PRAM, etc when installing new RAM?

Dear Forum,
I've just ordered Kingston DDR SDRAM - KTA-G5400/2G 2GB PC3200 Kit - for my G5 Dual. My machine has 8 slots. This new RAM will occupy slots 4 and 5. I've checked that this is definitely the correct RAM for my machine.
I've read what Samara and Japamac have to say about resetting PMU,PRAM, and NVRAM.
Can you elaborate on this please? Where is the reset button located for my G5 Dual Processor? Is the reset performed before or after the installation of new RAM? The .pdf RAM installation manual (downloaded from this forum)does not mention any necessity to perform a reset, and does not identify the location of any button either?

Go to System Preference control panel Startup Disk and set it.
I'd use Option key to look for your boot drive first time anyway.
NVRAM
Non-volatile random access memory (NVRAM) is the general name used to...
http://en.wikipedia.org/wiki/NVRAM
PRAM: Parameter RAM, a small amount of NVRAM used on Apple Macintosh machines to store configuration information
http://docs.info.apple.com/article.html?artnum=2238
http://www.geocities.com/texas_macman/pram.html
http://www.felipecruz.com/reset-pmu-and-non-volatile-ram-g5.php
... there is a huge at-your-fingertips dictionary-encyclopedia-reference online and a click away...

Reset PMU after removing battery

Is there a line missing in the instructions at http://docs.info.apple.com/article.html?artnum=14449 for resetting the Power Management Unit for the iBook G4 among others? They do not mention removing the battery and power cord. The instructions for several other Macs do say that. I could only get my new battery (from the recall) to start charging after resetting the PMU with the battery & power cord removed.
iBook G4 12 inch Mac OS X (10.4.7) New battery from recall on 8/14/06

Since the iBookG4 1.33 mid-2005 model is similar to the
PowerBook 12" from that era, the procedure to do the PMU
is not surprising in its success, as you have found.
Even though the instructions do not say it, I read in a pdf
file where that is an option for the iBookG4 last model, too.
Good that you pointed this out, as the instruction is not
exact in this regard. ~ Thank you, too!

I reset PMU, and now, no startup...

Greetings, all. I turned off my computer, pulled the power cord, hit the PMU button, shut the door, attached the cord, and waited ten seconds and then hit the power button. And now the computer will not startup.
One thing to point out is the I was experiencing kernal panics as the only functionality of the system, and so I replaced the internal drive. The internal drive does not have an OS installed...but I do not believe this makes a difference, as hitting the power button yields no results at all.
Any suggestions?
Thanks!
Vince

Is there any indication that it's trying to start?
Based on your description, you followed the procedure in this document. *Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3*
http://docs.info.apple.com/article.html?artnum=86760
Hopefully, you didn't press the PMU button more than once, because this can cause the internal memory battery to discharge quickly. You need to check the voltage on the battery. See Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
KPs are usually caused by hardware problems, frequently RAM. Disconnect all external devices except your mouse, kbd & monitor when troubleshooting.
 Cheers, Tom

How to reset PMU in Digital Audio G4?

Are there any procedures required other than powering down, disconnecting all leads, opening the case and pressing the PMU button (located on mobo with "S1" marked next to it ) ??
I can not find any tech articles on resetting the PMU on a Digital Audio G4 Power Mac despite doing numerous searches.
Thanks

Hello Murray and Thomas,
On my dual HD, dual boot DA, I had a similar problem following an unsuccessful attempt to install a flashed PC Geforce 3 video card.
Wouldn't boot in OSX at all, would boot in OS9 only if I unplugged the OSX(10.3) HD and set the startup disk from the OS9 install CD.
Reset the pmu, no help; repaired permissions, no help; ran disk first aid - DFA said fine; ran Disk Warrior - DW said fine; I could see all drives - I just couldn't boot. All I got was the Apple prohibitory sign - the "No Parking" sign.
Solution was tu reinstall OSX. Install went smoothly and have had no problems since.
HTH ..... Jon

Reset PMU and Powerbook won't boot past the blue screen with "Mac OSX" box

Hi-
Problem: I tried to reset my PMU, and now when my computer restarts it won't go past the blue screen with the "Mac OSX" logo in the box (and progress bar, that never fills up). I then also tried to reset PRAM, but it still won't boot properly.
Backstory--
I've had my 12-inch Powerbook G4 for about 3.5 years already, so things are starting to get a bit out of whack. I replaced my battery about 3 months ago, which has been great, but recently my power-cord has been wonky (having to unplug it and replug it in to make sure it actually charges the computer, the light flickers on and off, etc). Today it actually started producing SPARKS at the place where the thin white wire meets the white plastic power brick, so I decided it was time to get a new one. Brought it home, plugged it in, and since it seemed like the battery indication icon on the menu bar was all out of sync with the powercord colored-light, I tried restarting it a few times, but still the same. Then, I decided to reset the PMU, which may have been a huge mistake. And now it won't boot past the blue screen... Any advice? I'm going to try restarting it in "safe" mode, but I'd be so grateful for any recommendations. Hope I haven't done something irreversibly stupid with the PMU reset.
Thanks,
Samantha

Hello all,
Thanks for all of your great suggestions and info-- here are a few responses.
1) The disk I just borrowed from my friend appears to be the full retail version-- it looks just like the links that Ali B sent, and is in a large box saying "Mac OSX Tiger, version 10.4"... will this be the proper disk to do an Erase and Install? The only other disks I have came with my Powerbook when it was originally purchased, when it came Panther (I think, 10.3?). Would I use both sets of these disks to do erase and install? Or only the Tiger OSX disks?
2) I get the sense that Disk Warrior or Tech Tool might be necessary, but does it make sense to TRY to do erase-install before buying them? Also, are there any downloadable (for pay) versions of this, or would I need to track down the actual physical disks in Hong Kong or wait for them to be shipped?
3) I haven't yet tried the S.M.A.R.T. test, should I do that first? What is the procedure? Are there any results or ways to know if the drive is too far gone (so that I might instead replace the internal hard-drive) instead of pay 100 USD first to do the disk repair?
4) Cornelius said: "An alternative would be to completely reformat and erase the entire HDD, then re-install and restore your data from backup. If your backup is in the form of a bootable clone of the entire HDD, you can just clone it back." I use Super-Duper to back-up and the most recent one copied the whole thing-- what would be the later procedure of "cloning it back"?
5) As I'm able to use my computer pretty normally right now, but does it still mean that it might crash/die at any moment? Is there any way to tell?
Thanks so much!

Resetting PMU in June 2004 G5

I've got the dual 2.0 G5, June 2004 edition. I'm trying to find the proper procedure to reset the PMU. The Apple support pages show resetting the SMU in Late 2004 models, but I can't find anything for the June 2004 edition of G5.
Thanks,

Well - the practical test tends to be - has it got a reset button as shown in the photo here
http://docs.info.apple.com/article.html?artnum=300341
If so, use the second procedure.
If not, use the first.

Procedure - reset PMU on XServe G4

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