Power cut with imac 21" 3.2 ghz!!

Had a power cut when imac was on then could not turn imac on againtried everything ,contacted apple did what they suggested,still would not work!
Next morning tried again,still not working, went out for an hour or 2 came back pressed start button on back of imac,and it came on!!
Logs show no faults,but did recognise an improper shutdown!!
What could be happening!!!

You might want to keep this on file the next time things go wonky:
SMC Reset
Shut down the computer.
Unplug the computer’s power cord and disconnect peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
Reset PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P and R.
You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
An SMC reset often helps to restore power/startup to normal.
You may want to consider getting a UPS which should give you protection against power outages and surges. Allows the Mac to do a controlled shutdown and you can also connect various other sensitive devices.
Many on here recommend APC: http://www.apc.com/site/apc/index.cfm

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Hi,The USB ports on the keyboard are part of a USB non-powered hub.
Non-powered hubs often can't provide sufficient power to bus powered USB devices. But I am very surprised that a Flash Memory Stick is drawing more power than the keyboard can provide.
The first thing to do it open Apple Menu > About This Mac... > More Info. Then click on the USB section. Have a look how much power (listed as a Current value) is being drawn by your devices. For example. My Apple keyboard Hub takes 500mA current. My M$ mouse is 100mA and Keyboard is 250mA.
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Follow the instructions from the link you posted from for Resetting the System Management Controller (SMC)

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A Power Surge can sometime cause your equipment to get cooked and render your equipment virtually useless.
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http://www.apc.com/site/products/index.cfm/homeoffice-nam/?segmentID=1
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I am about to buy my first Apple Mac, an iMac 24 inch, a possible future problem I can for see is that here we get daily power cuts lasting between 5 minuest to 5 hours , I am planning on Buying a an UPS (uninterruptible power supply ) which I hope should automatically Close down the iMac when I am not there.
My questions are.
If I am at the computer when there’s a power cut is there a quick way to shut it down That will not cause any long term problems to the computer say if ive no applications or work In progress that need saving I just need to shut the computer down - on this PC ive got a one click quick shutdown option
If I am at the computer when there is a power cut , and the UPS gives me time to manually turn of the computer before the power totally goes off, is there a correct fast Way to go about saving documents Etc and then shut off the computer in such a way that it will not affect the computer in any long term way.
If the computer is set to sleep and there’s a power cut , the UPS should shut it down Automatically , what would happen when the power is restored , would the
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1. If I am at the computer when there’s a power cut is there a quick way to shut it down...
In the top left corner of Mac OS X is an Apple menu available in almost every app you may be using with a Shut Down command. Mac apps are written to interrupt a Shut Down to query what to do about open files with unsaved content. After you have been given the opportunity to Save or Don't Save open files the Shut Down proceeds.
2. If I am at the computer when there is a power cut , and the UPS gives me time to manually turn of the computer before the power totally goes off...
The UPS should give you more than enough time to safely save all open files, quit open apps and shut down the Mac. The quickest way to begin this process is the Shut Down command in the Apple menu. You should purchase the UPS that gives you the most time to take care of shutting down within your price range.
3. If the computer is set to sleep and there’s a power cut , the UPS should shut it down Automatically , what would happen when the power is restored...
From my own experience of a homeland with an unreliable electric supply, I personally don't see any advantage of having the Mac restart itself to only be put to sleep. Especially if the power interruption is caused by an ongoing storm which may continue to interrupt the power
4. Does any one think that the regular power cut's syndrome may in any way affect the long term running and reliability of the computer...
Macs are made to be left on 24/7, without being put to sleep. I sleep mine when not in use. My experience with Macs is they can take this power interruption in stride. Mine have for 24 years. I am grateful our federal power monopoly has improved over the years and my UPS is called upon to do its job much less frequently today!

I have an old (first generation) iMac that I still use sometimes for the applications that are on it. I was using it yesterday and unfortunately had a power cut. I went to turn it on today, and nothing at all happens. It's as though no power is getting to

I have an old (first generation) iMac that I still use sometimes for the applications that are on it. I was using it yesterday and unfortunately had a power cut. I went to turn it on today, and nothing at all happens. It's as though no power is getting to it. I've checked the obvious things, changed the fuse, tried different cables, poked paperclips in reset holes, but nothing doing. I wonder if there is anyone who knows what might be wrong. I was hoping to get some of its content transferred soon, but I'm guessing that can't be done if it can't be started up. Many thanks, if you can help

Hello,
>It's as though no power is getting to it.
Would it be correct to assume that no sounds at all can be heard? Also, no lights, not even green or amber at the power button?
>unfortunately had a power cut.
Was it possibly a power cut in connection with a thunderstorm? Any other evidence of higher than normal voltages (light bulbs, et cetera)? Has the line voltage been checked (measured with an appropriate voltmeter/multimeter)?
If necessary, it would be possible to remove the hard drive, and then connect it to an external IDE/ATA to USB adapter (example below). That way you could gain access to files on the hard disk from another computer.
http://www.newertech.com/products/usb3_universaldriveadap.php
Jan

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HI Phillipe and Welcome to Apple Discussions...
If you haven't done so, try running the Apple Hardware Test.
http://support.apple.com/kb/HT1509
I doubt repairing disk permissions can't help this problem. It sounds like a hardware issue.
*"I booted from the Install disk and ran Disk Utility - seemed fine though I could not verify the disk permissions ?"*
When you ran Disk Utility via Firewire, did you actually Verify the hard disk for errors?
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Hi,
I was working on a Word document when we had a power cut yesterday afternoon. They then said it was OK, the power came back on and I stupidly believed them and turned the iMac back on.
Within second, just as it got the grey screen with the Apple sign and little grey wheel, the power went again. It has been back all night, so have tried to get it started this morning and although it starts with the little tune and goes to the grey screen with the Apple sign and little wheel, after an hour nothing more?
I powered down and tried again holding down the Shift key as I started, but it the same, little grey wheel nothing else?
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Many thanks in advance.
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HI Anamusic,
Many thanks for the link I will save it, but unfortunately I have a wireless keyboard and tracker pad, so I don't think the keyboard is active when I need to use it, I have tried but it seems to be exactly the same.
Thank you for your help anyway.
Do you know if this something they might be able to fix in the 'Genius Bar' or will I have to take it to a Mac repair place?
Sorry never had problems like this before and just don't know what to do.
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Macs that can be upgraded to OS X Mountain Lion
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Great advice. And I'll definitely do that - need to get my Mac back on and working before that however.

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Try the following:
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http://support.apple.com/kb/TS1587 Intel-based iMac: What to do if your computer won't turn on
http://support.apple.com/kb/HT3964 Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT1379 Resetting your Mac's PRAM and NVRAM

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http://support.apple.com/kb/HT2712
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andyBall_uk wrote:
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Power cut with imac 21" 3.2 ghz!!

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