Reset PMU again after 2 months?

Hello.
About 2 months ago my computer wouldn't turn on. I reset the PMU and that did the trick. I got the computer in 2002 and never had to do this before. Well last night, it wouldn't turn on again. I'm going to reset the PMU again and see if that does the trick.
My question is, what would make it not work again after only 2 months?

Have you ever changed the battery? They only last 4 or 5 years if you never unplug the unit. I would check it first. When mine went, I had no response from my Mac at all; just a light on my power button; absolutely no boot at all.
Check out things in Texas Mac Man's tutorial on the subject. His tutorial is a little dated (don't believe it even mentions G5's) but the info in it, except SMU not being included, still applies.
Cheers!
DALE

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HT201363 Dear Reader I have forgotten the answers to my security-questions. So it says that i will get an e-mail to reset my questions, but i have not gotten an e-mail? So i tried it again (after a month) and it still doesen't work. I really need to know

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Ibook resets pmu automatically after charging

here's a good one:
i recently replaced my adapter with a macally one (45w). i also replaced my battery. recently, i was having issues with my ibook booting up, but after initally resetting the pmu, everything was fine. now, it runs fine on battery or a/c, but when i charge my ibook, it will not boot on when it finishes charging, AND if it happens to be asleep when this happens, it shuts itself off. in every case, if i remove the battery, wait a few seconds, and boot up with just a/c, everything is fine, though the ibook automatically resets the pmu.
any ideas of what is going on? i have a g4, early 2004.

Hi, and welcome to Apple Discussions.
Does the shutdown happen at the same time each day? If so, go to System Preferences > Energy Saver and click on the "Schedule" button at the bottom right of the pane and make sure a shutdown isn't scheduled.
When you got the new battery, did you calibrate it?
Resetting the PMU may help alleviate the problem with it resetting the time. Just because it resets the time does not mean that the PMU has reset itself.
Every time there is a forced shutdown instead of a normal one, as it seems is occurring with your iBook (unless it has been scheduled for a normal shutdown), there is a chance of hard drive damage and you should repair the hard drive, either by booting into Safe Mode OR by starting up from the Mac OS X Install Disc by inserting the disc and restarting your computer, holding down the C key at the end of the startup chime. Then choose Installer > Open Disk Utility (in Panther) or (in Tiger) click 'Next' at the language screen and choose Utilities > 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 either Safe Mode or the Install disc's Disk Utility, then start up normally and repair permissions from Disk Utility in the Utilities folder on the hard drive.
Is the replacement adapter charging your iBook all right? Does it run it okay when the battery is not installed? I would suspect that maybe it is a problem with the adapter not working right. Can you maybe swap with someone who has an adapter that is known to be working right and see if it works okay with your iBook?
Let us know how things go.

Yahoo Business Mail finally working again after 11 months

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There's no question in there, so why is this marked as a question? Further, not only in this message, but in many of your posts, you seem to be awfully fond of all caps. You need to be aware that this is a great way to ensure that people don't read your posts. Also, think a little more carefully about what you're going to write before posting... flow-of-consciousness is not the easiest to read, and thus is also a great way to get people to ignore your posts. Try to organize your writing better.
I'm not trying to be insulting, but you do need to know that a post like this one gives a negative impression to the reader, and if you actually were asking a question, it reduces the chances of getting that question answered.

IBook Rises From Dead After 3 Months! Baffled Family Member Needs Answers

Hi
This is a rather long-winded post, so apologies/thanks to those of you patient enough to read to the end and to anyone who can shed some light on something that is baffling me regarding my iBook G3 700MHz (mid-2002 - I think).
This iBook has been an absolute trojan, working virtually 24/7 since I got it.
Anyway, one day about 3 months ago it just wouldn't power up. Nothing. No sound, no movement or any other sign of life.
I called my local Apple dealer and they told me about the PMU reset (mentioned elsewhere in these posts), which I did, and lo and behold the old beast fired up again. There was much rejoicing. All I had to do was reset the date and everything was sweet.
A day or so later I turned it off to take it to work with me, as usual. When I got to work and tried to start up nothing happened. Dead.
I tried the PMU reset again, to no avail. Nothing would get it going again.
I took it in to the dealer for them to have a look at. When I phoned back in the evening they said the logic board was dead and would need to be replaced at a cost of AU$1,000 (about US$800)! When I asked whether there wasn't an internal battery that could be replaced, I was told the iBooks don't have them - a fact which seems to have been confirmed in other posts in this forum.
I decided to buy a new iBook.
I've been waiting now for over 2 months for my new BTO iBook, but the dealer has lent me another iBook to tide me over until it arrives. The ridiculous wait for my new iBook is something I can cover in another rant, so I'll cut to the chase now...
Today, I was tidying up and decided that i should put my dead iBook away in its box and maybe one day I'd buy a second-hand logic board on eBay or something, fix it up and use it as an iTunes player or something...
Anyway, just before I put the dead iBook into its coffin, I thought I'd just give the power button one last push, for old times' sake.
The beast started up!
Again, there was much rejoicing. Again, all I had to do was reset the date/time.
So, as I type this on my loan iBook, I'm listening to iTunes via my SoundSticks on the old machine.
My question is this...
What has really happened to my iBook?
If the logic board is dead, why did the machine start up again after 3 months lying dormant?
If there is no internal battery, why have I had to reset the date/time both times it restarted? Wouldn't it be logical to think that some kind of battery was storing these settings?
Doesn't it seem reasonable to think that there is some sort of battery inside the machine which has slowly built up enough charge over the last 90 days to allow the computer to boot again?
Is it that there is in fact an internal battery built in to the logic board, and when the dealer told me it was "fried", all they really meant was that the battery was dead, but because it was on the logic board that the whole thing had to be replaced?
Obviously, I'm not going to turn the old iBook off again. I'll just put it to sleep when I'm not listening to music through it, but I'm just wondering whether any of you really smart people can tell me what's going on.
I really feel that this is miraculous and need some kind of clear answers to these questions.
Thanks for any help you can give me.
Matt
iBook G3 dual USB 700MHz Mac OS X (10.4.4)

Hi, Matthew. Welcome to Apple Discussions.
It is not uncommon for an iBook with a bad logic board to work intermittently.
There is no internal battery in an iBook. A capacitor holds the date/time information long enough for you to switch batteries, or for a short time without battery or AC power. The only battery is the main battery. If it has been left without use for some months, the capacitor has simply lost the date and time due to disuse and lack of power during that time.
When you do a PMU reset, this makes the time and date default, also.
Your iBook has been acting as one would expect, given the circumstances.
Mystery solved.

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.
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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.
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http://support.apple.com/kb/HT1939
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Hi hnssiva,
The answers to Pat's questions will help us get to the bottom of things. In the meantime, please check out this document: http://helpx.adobe.com/creative-suite/kb/acrobat-failed-launch-30-days.html, as it sounds like you may be running into the issue it covers.
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Hi Lawrence,
I've done the "RESET" Power down and Power up. Haven't done a reset and restore yet. The Reset seems to have worked for now, but what seems to happen is that after using Safari for a while it will start to slow down again until I do another Reset.
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WIRELESS CONNECTIVITY--RESET PMU

Here is the deal with my Powerbook. I have been connecting to my wireless Linksys router no problem for 3 months or more. All of a sudden one day it says I have excellent signal and am connected to the network, but it cannot connect to the internet via Safari, Firefox, or IE.
I tried many things and finally stumbled across a site telling me to reset the PMU (take battery out, press and hold the power button for 10 seconds, put battery back in and reboot). Every time I do this it connects perfectly to the internet. However, if I let it go to sleep mode or even close the book for 5 minutes I must reset the PMU again before I can connect.
I have very little knowledge of anythign other than a PC running on Windows. Can someone please tell me WHY I have to do this, what it is doing, and how I can fix this problem because these macs cost WAY too much money for problems like this with no support from Apple (without paying extra).

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Reset PMU again after 2 months?

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