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

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Problem: Qosmio 505-Q850 turned off without warning and won't start up

The unit switched off without warning leaving only the LEDs for external power and the battery lit.
When the power button is pressed, it lights up for a moment before dying again. A few seconds later it lights up again before quitting again. While it's lit up the power LED is also lit and a slight vibration is felt from the unit.
Other than the slowly blinking lights and the slight sound/vibration, there's no life from the unit. Any ideas?

Sounds like it aint charging properly... could be a break in the charger wire right before the connector or the internal power connector is bad. the is supposed to run on the charger power alone without the battery intalled. if it does not its definitly the charger or the internal connector. If it does come on with the charger alone let it run for a while an then feel the the power connector and wire to see if its hot. If it is, this can be an indicator of an break in the wire or or a bad internal connector.

HP 250 Laptop - When running on battery turns off without warning and won't restart

One month after warranty expires this laptop presents with this problem. It shuts down without warning when running on battery, although the battery has plenty of charge. Following shutdown it won't restart on battery. Plugging in power and restarting it displays a message that the battery is cactus before continuing to boot. When trying to run F2 on startup battery check it simply doesn't progress past the initial screen (1%) and [esc] key does nothing. Need to power off. However, REMOVE the battery, boot the computer, shutdown, REINSTALL the battery, turn on and everything is OK - most recent example showing battery with 95% remaining. Continues to work for a few days until it decides to fail again. Suspect the battery is not at fault here, and in any case can't get a replacement (thanks HP for providing equipment with rare and unusual parts) - one supplier has only two on order which will be delivered some time in September!! Usual third party providers don't provide a replacement for this battery. Have seen a lot of references to this sort of mystery "battery failure - shutdown with warning" but no concrete solution. Have tried different power setting including never hibernate, but these seem unrelated. Open to useful suggestions at this point.

One month after warranty expires this laptop presents with this problem. It shuts down without warning when running on battery, although the battery has plenty of charge. Following shutdown it won't restart on battery. Plugging in power and restarting it displays a message that the battery is cactus before continuing to boot. When trying to run F2 on startup battery check it simply doesn't progress past the initial screen (1%) and [esc] key does nothing. Need to power off. However, REMOVE the battery, boot the computer, shutdown, REINSTALL the battery, turn on and everything is OK - most recent example showing battery with 95% remaining. Continues to work for a few days until it decides to fail again. Suspect the battery is not at fault here, and in any case can't get a replacement (thanks HP for providing equipment with rare and unusual parts) - one supplier has only two on order which will be delivered some time in September!! Usual third party providers don't provide a replacement for this battery. Have seen a lot of references to this sort of mystery "battery failure - shutdown with warning" but no concrete solution. Have tried different power setting including never hibernate, but these seem unrelated. Open to useful suggestions at this point.

Macbook air turned off without warning?

Hi! Last night my macbook air turned off without warning and wouldn't turn back on until I tried again this morning. A few weeks ago I had my battery and logic board replaced and since then it the screen has gone blue for a few seconds and then back to normal a few times, (in case this is related at all). Is there something I should do to make sure this doesn't happen again.

As you say it is just been repaired I would take it back to the place that repaired it and ask them to look at it.

Computer turns off without warning on battery power

Starting a few weeks ago I've found that my Macbook Pro has been turning off without warning while on battery power. The first time this happened it was after about an hour of use and now it happens within a half hour or less. If I try turning it back on it shuts off before OS X is fully loaded. According to CoconutBattery my battery's health is at 97%, so the battery isn't losing overall charge capability. When I'm on battery power it says I have 2-3 hours of battery life left. Sometimes I notice this will drop between 1-2 hours after 20-30 min of use (if it'll stay on that long) but it never drops and gives me a warning of low battery. It just shuts off without warning. If I press the button on the battery after this happens I do get 4 out of 5 lights. This never used to be a problem. My computer is 14 months old. I've replaced the battery once about 8 months ago (under warranty) because my original battery was losing capacity very quickly. Because 14 months have passed I can't simply get a new battery under warranty. According to Cocoanut Battery and the Finder my battery should last near it's full capacity. I can't figure out why it's randomly shutting off. I have had all the latest updates including the recent battery patch. Any help would be greatly appreciated. I will award "solved" for a solution and "helpful" for posts that contribute to the solution. thanks!
Message was edited by: Vegabondsx
Message was edited by: Vegabondsx

Because 14 months have passed I can't simply get a new battery under warranty.
Actually (and fortunately), that's incorrect. Apple extended the warranty for all Core Duo notebook batteries to *2 years* from date of purchase. Details are here:
http://www.apple.com/support/macbook_macbookpro/batteryupdate/
Your full charge capacity is fine (as you noted). But one of the symptoms listed on the linked page is +"Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count (as shown in System Profiler) of less than 300."+ The word runtime in there applies, so I would call Apple or make a Genius Bar appointment and head into a store. (I did the latter, they replaced mine - free of charge - 15 months after purchase, no AppleCare, and no hassles).
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These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CSeq 'n Cause: -' | tail | awk '/:/{$4=""; print}' | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
Wait for a new line ending in a dollar sign ($) to appear below what you entered.
The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.
The Terminal window doesn't show the output. Please don't copy anything from there.
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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).
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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.
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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.
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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.

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

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