IMac G5 suddenly turned off!

Hi,
My iMac G5 suddenly turned off and looked like the power cable disconnected. But I am sure outside of the iMac, the power is no problem.
After this, I tried to power on my iMac G5 with the power button, iMac got a loudly beep sound with the light flashing. Although it can startup to the login window, but when I login to system, again, the iMac was dead with the same situation.
Then power on again, same sistuation was still there (loudly beep sound with the light keeping flashing. Now, after login, the system seemed to be good till now (2hours).
Anyone can help me to figure out the porblem? Is it possible that iMac got the high temperature (because here my room is a little bit hot)
Thanks!

Welcome to Discussions - which model do you have (how to identify your iMac)? It may be that your power supply unit is failing, see if you qualify for either of these Rev A and Rev B repair extension. You might also try cleaning the air vents and vacuuming the inside of your machine (don't open it if it's an iSight). Some people train a fan on the rear of their iMacs if their rooms are very hot, it helps keep the computer cool.
Miriam

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My Imac will suddenly turn off without warning and then take several hours before it will switch back on again

My Imac will suddenly turn off without warning and then take several hours before it will switch back on again. Can anyone advise?

I like that third tag...
There's really no telling what the problem might be - you may want to try running the Apple Hardware Test (if you can) to see if you've a hardware issue. If you can't even get to the AHT, you've no option but to take the machine into your local Apple Store or an AASP and have them run diagnostics on the machine.
Sorry,
Clinton

IMac i7 - Suddenly Turns Off

The iMac suddenly turns off while I'm working. I've owned the unit since August 2010 but this problem has just started occurring. I think it has happened three times in the past two week.
I've heard about this problem, but have not experienced it until the past couple of weeks. I do have Crucial RAM installed. Before I go to too much trouble, or take it into Apple, I thought I'd check the forums to see if anyone has nailed the problem or come up with a solution.
I there is an easy solution I would be most grateful.
Thanks if you can help.
Linda
Message was edited by: Linda - PBCS

I think your random shutdowns are caused by RAM incompatibility. This problem has been widely reported in this Discussion, and if you do a search by keywords “random shutdown” or “sudden shutdown” or “turn off,” you’ll find dozen threads on this subject.
1) First, did you add RAMs to your iMac? If you have 16GB installed, go down to 12GB i.e. pull out the 8GB you added and reinstall the 4GB that originally came with the iMac. If you need 16GB, purchase 16GB of Samsung brand RAM.
2) Although the shutdowns are generally associated with people who upgrade to 16GB, it does happen with 8, 4, or 12GB and with factory-installed RAMs. If this is your case, pull out the RAM from the slots, and see which RAMs you’ve got. The factory-installed RAMs in the iMac can be made by Samsung, Hynix, or Micron Technology. Whatever RAMs you get, change with Samsung RAM you purchased from a reputable seller.
3) The RAM fix is very easy, fast, and works instantly. My advice as a fellow Mac user is to do the RAM fix BEFORE you call Apple, because apparently Apple does not acknowledge this problem and will do everything for you (change power supply unit, mother board, and eventually the entire computer) but not the RAM switch, without solving the problem.

IMac suddenly turned off

Hi,
I was working on a word document and my iMac just suddenly turned off and cannot be turned back on.
I have tried SMC reset but no luck. Can someone please help?
Thanks.

Try plugging into another outlet it may be the outlet you are using. Does it make any sound at all or have any video.
Finally complete your profile, you will not get help without giving us any clues. The profile is there for a reason, your post is like says "my car is broken what is wrong?"

IMac 2008 emc 2211 suddenly turns off and back on, RAM problem?

I have an iMac from 2008 emc 2211.
Two years ago i upgraded my RAM from 2GB to 4GB Crucial memories.
Two weeks ago my imac started to suddenly turn off and back on inmediatly. Recently it stared to happen more often to the point that it can't boot completely and show the desktop
I checked the power source and it was fine.
I opened the computer and pulled out the power supply and it seamed to be fine.
I tried to run the hardware test with the disk that came with the computer and it can't even finish the test because it turns off.
Before it couldn't boot anymore i checked if it was overheathing with smcFanControl and the temperature was always around 44C, so it was fine.
Could this be the crucial RAM that is failing?
thanks in advance.

Ok, i've replaced the RAM and the power supply and the problem persist, so it seams to be the logic board that is failing.
Any ideas?

My Apple iMac MB418LL/A 24-Inch Desktop suddenly turned off

My iMac MB418LL/A 24-Inch Desktop suddenly turned off and now doesn't respond to the power button even after the SMH (right acronym?) reset procedure.

Please do not startup duplicate topics.
I replied to you here > https://discussions.apple.com/message/18090261#18090261

Macbook Pro suddenly turned off, not charging either.

My Macbook Pro suddenly turned off last night. I've tried all the troubleshoots listed in the user manual. Thought it was just batt low but it would not even charge, neither the battery sign located on the left side wouldn't show any sign/blink/color. Please help me, it's just 8-month old and Im not sure what could be the reason of this problem. PLEASE AND THANK YOU

MonicaDCC wrote:
Hi i'm sorry but what is SMC?
System Management Controller
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs. These functions include:
Responding to presses of the power button
Responding to display lid opening and closing on portable Macs
Battery management
Thermal management
The SMS (Sudden Motion Sensor)
Ambient light sensing
Keyboard backlighting
Status Indicator Light (SIL) management
Battery status indicator lights
Selecting an external (instead of internal) video source for some iMac displays
You didn't click the link to Apple's instructions and explanation, why?
Here it is again, click, read, follow the links for your machine and the instructions how to perform or take your machine in for service.
https://support.apple.com/kb/HT3964

IMac G4 just turned off and won't turn back on

When I woke my iMac G4 from sleep, it turned on then all of a sudden turned off and shut down on me and won't turn back on. Any suggustions? It has Mac OS X 10.4.11 and before today worked perfectly.

Replies to such old threads are likely to be a bit curious.
Mostly as to a reason why they are brought up, now.
The link to XLR8 page shows an earlier iMac G4 model
and that is slightly different than the last iMac G4 USB2.0
(15"/17'/20") models. They tend to be more like this inside:
•Mr Totes iMac G4 USB2.0 take apart:
http://www.mrtotes.co.uk/page1/page1.html
Thermal paste and other steps are required with access
into these layers where the 3.6V 1/2AA lithium battery,
and factory RAM slot, HDD, optical drive, etc, are located.
•3.6V Lithium 1/2AA PRAM clock battery, example:
http://eshop.macsales.com/item/NewerTech/BAA36VPRAM/
Also, the 17"/20" can use 2048MB RAM when both slots
get upgraded to 1024MB each, respective to type in each.
The bottom slot uses the same SODIMM as the last iBook
G4 (mid-2005) does, as an upgrade, exact in specification.
The power supply can be tested via small ports in the bottom
under metal plate (by reset button, by airport card slot) to
see if the power supply has failed in one of its voltages.
Anyway, curious to see an old thread come up like this.
In any event...
Good luck & happy computing!

Why my iMac 27 2010 turn off by itself?

Why my iMac 27 mid 2010 turn off by itself?
I already replaced the Power Supply part number 661-5972. The next thing is replace all the thermal sensors and then the logic board. I do not have any other way to find out what it 's wrong with it.
Last the same time that the old power Supply. Let it sit for a few hours. Turn back on and works fora few more days or weeks ans suddenly turn off again.
I am 66, started out with Apple around 87 as an independant service provider here in PR and have never had so much problem with any other mac's than this one.
Apple support provider here in PR have no expertise what so ever in giving us solutions to problems. Even thought I still doing some support to some of the old customer I am handicap with new technical tools to solve problems within new products. I wish Apple would have consideration on the old ones that help and support apple products without their help.
Thank you for reading my note!
Jose A Marrero

I can relate Jose
Have you looked under the hood of a newer car, worked on a new toaster or coffee maker..? Most all of them have sealed components that are no longer repairable, you throw the old part away and replace it with a new part or just replace the whole thing.
Heck' for the most part even the Geniuses at the bar are unable to fix or do anything about most hardware problems. So instead of trying to fix a product that is under warranty, they either send it out or replace it with a new Mac, Pad, Pod or Phone on the spot.
As another Apple user like yourself with some hands in experience and some time here in ASC, it sounds more like either a overheating graphic's chip or bad SMC chip than a temperature sensor problem. Both of which the normal Hardware Test will not catch.
So on that note: I would probably closely monitor all the temperature sensors (especially the GPU temperature) with iStat Pro or Temp Monitor to see if you can catch an overheating component that is causing the shutdown.
It also might help to post the Consol Message for the shutdown here in the ASC forum.
Dennis

MacBook suddenly turns off at 40% of battery charge and trackpad doesn't work

Hello,
I had to replace the battery of my white MacBook (13 inches, mid 2010), because it was swollen, and the capacity was about just 20-30% of its original one. I bought a new one. Specifically, this one. After replacing it, I have those problems:
When I run on battery, the computer suddenly turns off at about 40% of the charge. No warnings. Just turns off.
The trackpad is not working properly. I can move the mouse, but I can not click. The swollen battery was pusing the trackpad, and I guess it's broken now. I don't know if I can replace it.
Coconut battery tells that the maximum charge of the battery is below the design capacity. Not sure if this is a problem, or Coconut battery is just comparing my battery's numbers with the theoretical numbers of a brand new battery. Check a screenshot
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I've tried resetting the SMC, following these instructions. Specifically, pressing (left side)Shift-Control-Option keys and the power button at the same time, releasing all the keys and then pressing power button to turn on the computer. Not worked. I think it was even worse.
Could it be a problem of this specific battery? Or maybe just the MacBook doesn't accept batteries like that one? It's not original.
In the first case, I would return the battery to get my money back. In the second case, I guess I should have bought an original one.
Additional data that may be useful:
Mac OS X 10.8.5 (12F4S)
EFI boot ROM version: MB71.0039.B0E
SMC version: 1.60f6
About EFI boot and SMC versions, those are the last available official updates, obtained from here.
Many thanks in advance.

I'd say it was a faulty battery.

My iphone 3gs suddenly turned off and does not want to turn back on.

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Charge it with a wall charger for 15 minutes, then hold the HOME and SLEEP buttons until an Apple logo appears, about 10 seconds.

I have an ipod touch 4g it was just Fine and today i tried to plug it to my laptop to sync music and it suddenly turned off and it didn't work for 15 mins and then it worked but i can no longer sync apps or music plz help me as soon as you can

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If you have not taken the iPod apart, Apple will exchange it for a refurbished one for $99. You can do it an an Apple store
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Apple Retail Store - Genius Bar
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cutieliz wrote:
What do u think is the prob ?
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Imac does not turn off.

hello,
I have an imac, running on os x lion. u know how, when you click on shutdown, it shows the white screen. sometimes my imac does not turn off and keep showing it. could you please tell me what i can do to solve this problem.
thanks

The safe boot more or less resets system files.
When it is something in the hardware:
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http://support.apple.com/kb/ht1379
http://support.apple.com/kb/HT3964
2. shutdown the mac and startup while holding the ALT(option) key: choose the Recovery Disk, from the window choose Disk Utility, select the Lion disk, choose "repair disk".
When it is not a hardware problem:
3. List the applications you installed in the last 6 months, also the ones from the Appstore.
4. List the plugins (extensions) you have in Safari.

Macbook pro 2013 suddenly turn off and wheh charged its define only grren light and dont turn on.

Hi Friends..
I have mac book pro 2013. Today when I started its got suddenly turn off and also not turn on. The mac does not charged also not turn on. charger define only green light. I reset SMC but its not work.
Please If any one have Idea.

Hi Dipang,
If your MacBook Pro will not turn on, you may want to follow the steps in this article to try to get it up and running again -
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http://support.apple.com/kb/PH13978
Thanks for using Apple Support Communities.
Best,
Brett L

IMac G5 suddenly turned off!

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