IMac wont start up after power shortage

Hi !
yesterday I had a sudden power outage in my apartment while my iMac (September 2010) was running. Now it won´t start when I press the power button. Any suggestions?

Zap the PRAM and Reset the SMC, then try again.
If no go, contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

Similar Messages

  • Imac wont start up after power failure

    i moved the table my imac was on and i accidentally took off the power cable.the imac was on so when i took the cable off it shut off. then i put the cable back and tried to turn it on but nothing happened..it is like dead. any suggestions?

    Also, there is a small battery or capacitor on the logic board that may need to be replaced, as this has been the cause of a similar issue over many generations of Mac computer hardware. Of course there are other causes of failure, and that is why the help of an expert to troubleshoot and diagnose issues to attempt to resolve them can take time.
    And it may not be resolved after the first attempt if the actual problem is deeper than first best educated guess arrived by troubleshooting. Part of some repairs requires replacement of suspect parts, even if they may not be the cause, to eliminate their being within the realm of possibility. A good read is among the original Apple Technical Service Manuals, those aren't often available to the general public. I used one to self-troublehoot an iMac under AppleCare after the nearby 200+ miles one-way distant 'specialist' could not fix my new iMac, four times. So I am a bit cool on newer Macs; the way I see it one new headache lasting 10 months and requiring 3,000 miles travel, to not be resolved by experts (and under warranty, so I can't touch it!?!) is enough.
    The best cure for main power failure, is to have a good high quality battery backup system in place with automatic voltage regulation, that also works as a power filter; and can step in to isolate the Mac from mains high-or-low power fluctuation. This can save many products from bad power sources; do not rely on these, either. Make copies of your work ahead of time. This saves your computer from issues you can prevent.
    PS: my Macs seldom are shut off, for up to 11 months, some of mine only get to sleep when not in use. When the main power goes offline, during a storm or extended utility failure of their own making, I will have to shut them off as a choice. There is software in the UPS unit that can help shut down automatically, and that is a choice, too. I usually find their software problematic on occasion; and the battery backup is not very long in duration, so one with a few hours runtime and a method of rationing the power if you are present when the mains fail, is helpful in performing a normal shutdown after a power failure.
    Good luck & happy computing!

  • IMac wont start up after upgrade to Mavericks

    I installed Mavericks as an upgrade to OS X 10.6.8 on my iMac and with in a half an hour of use my computer froze, I have tried all the normal rebooting techniques but my opening screen still has the vertical green stripes, even after using the disk repair/first aid utility, the iMac freezes without fully booting. the disk repair found no issues and says all is OK.

    Hello Tone56,
    It sounds like you are unable to successfully boot your computer after upgrading to Mavericks, and are seeing some graphical anomolies on startup. I recommend starting by resetting your PRAM with this article:
    OS X Mavericks: Reset your computer’s PRAM
    http://support.apple.com/kb/ph14222
    Note: To print these instructions, open Help Viewer’s Action pop-up menu (looks like a gear), then choose Print.
    Shut down your Mac.
    Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on your Mac.
    Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.
    Release the keys.
    Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
    Then reset your SMC:
    Intel-based Macs: Resetting the System Management Controller (SMC)
    http://support.apple.com/kb/ht3964
    Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
    Shut down the computer.
    Unplug the computer's power cord.
    Wait fifteen seconds.
    Attach the computer's power cord.
    Wait five seconds, then press the power button to turn on the computer.
    If the issue persists, try performing a Safe Boot then restart as normal to see if that will allow you to boot normally:
    OS X: What is Safe Boot, Safe Mode?
    http://support.apple.com/kb/ht1564
    Starting up in Safe Mode
    To start up into Safe Mode (to Safe Boot), follow these steps.
    Be sure your Mac is shut down.
    Press the power button.
    Immediately after you hear the startup tone, hold the Shift key.
    The Shift key should be held as soon as possible after the startup tone, but not before the tone.
    Release the Shift key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).
    After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.
    To leave Safe Mode, restart your computer without holding any keys during startup.
    Thank you for using Apple Support Communities.
    Cheers,
    Sterling

  • Imac wont start up after new RAM, no chime, black screen

    Hi, I've recently purchased a used 2010 iMac i3 that had faulty RAM.
    This was confirmed as the issue when I tested a friend's original RAM from the same age iMac and the machine worked perfectly.
    I then ordered 2x 4gb Crucial memory (upgrade from the 2x 2gb already installed) but kept getting kernal errors and RAM integrity check errors so the modules were returned and replaced by crucial.
    Prior to returning, I attempted to reinstall a fresh copy of mavericks, but the hard drive failed to completely format, and then the OS install also failed so the machine currently now has no operating system. However before returning the ram the machine would boot up and connect to the internet to attempt to download the OS again.
    The replacements have now arrived, but after installing the machine won't even boot. First attempt to start there is a drive noise, and the fans run, but no chime and a black screen. If I force shutdown and try again the drive noise happens twice and the fans run, but the same outcome.
    If I remove the RAM I still get the single bleep, and once of all of the times I've removed and reseated the RAM I've had a triple beep integrity check fail.
    Any help would be massively appreciated. Lost now as to whether the issue is with crucials RAM or the iMac itself.
    Thanks

    Do you still have the old ram? Was orig sticks of ram bad? What happens if you put only one stick of the orig ram back in ?

  • I have a iMac that wont start up after it sits for a short time

    I have a iMac that wont start up after it sits for a short time. I changed out the hard drive and reinstalled Leopard. If I mess with it a little I can get it to start up usually by repairing the hard drive with another computer, one time I just held down the P-R-option and command keys and it worked. Once its on it will restart no problem but if it sits for and hour or so it will get stuck either in the grey screen or blue screen. I also pushed the smu button but didnt work. Please help? Thank you.

    For this type of question, we need to know which iMac you have. This forum covers G3, G4, and G5 iMacs that have different hardware, and any recommendations are better handled if people know which you have. For starters, do "About this Mac" from your Apple menu and look at teh processor type.
    You also need to tell us the version of the Mac OS you have, also avaiabe from "About this Mac.
    If the processor type says "Intel," you have a newer iMac that this forum covers and should report in the area for current iMacs here:
    iMac (Intel)

  • Intel imac wont start after changing permission

    intel imac wont start after i changed my hard drive permission to let me read and write, then i clicked apply to all enclosed files.i turned it off no problem. then it never started up again in os x. the grey screen with apple logo appears,then after a minute it restarts, and will keep doing that if i let it. i can start up in windows xp, but i dont know how to do anything in windows xp that will affect os x. i can use the hard drive in target mode, but i cant figure out how that can help me. i use a macbook to view target disk. ive spent hours looking through help and support. finally i do not have the os install disks. PLEASE HELP!

    My apologies for the inept instructions.
    Restart normally. Open Terminal in the Utilities folder. Paste the commands in the Terminal application to avoid typos:
    sudo su
    Press RETURN. Enter your admin password when prompted.  It will not be echoed to the screen. Press RETURN again. Now paste each of the following at the prompt and press RETURN after each.
    chown root:admin /Applications
    chmod 0775 /Applications
    chown root:admin /Library
    chmod 1775 /Library
    chown root:admin /System
    chmod 0775 /System
    chown root:admin /Users
    chmod 0775 /Users
    chmod -R -N /Applications
    chown -R :admin /Applications/*
    Again, my apologies.

  • Option that SAP starts automaticly after power loss

    I am using an windows/sql ECC 6.0 server. I would like option that SAP starts automaticly after power loss. Is it possible and how?

    Hi
    I think this not possible.
    Thanks
    Pankaj Kumar

  • HT1455 imac wont start up and grey screen with spinning wheel appears

    imac wont start up and grey screen with spinning wheel appears

    See this Apple note on steps to take.

  • TS1367 my imac wont start

    my imac wont start

    I have the same problem, cannot solve it for you but maybe as i will have to take it to the apple store for service.
    what was you doing with it before it failed ?

  • Imac wont start stuck on apple logo lion

    imac wont start its stuck ont the apple logo with loading ring just keeps spinning im running lion its a 2009 imac

    If 10.7.0 or later...
    Bootup holding CMD+r, or the Option/alt key to boot from the Restore partitirion & use Disk Utility from there to Repair the Disk.
    If that doesn't help Reinstall the OS.

  • IMac won't boot after power failure?

    My iMac wont boot or respond in any way after I experienced a brief power outage. Now it can't seem to switch on at all even after attempting the different resets I've read on other discussions. Please help with advice on any techniques to fix it otherwise steps I must take to get it repaired. Thanks.

    Hello, not much you can do other than try this...
    Intel-based Macs: Resetting the System Management Controller (SMC)...
    http://support.apple.com/kb/HT3964

  • G5 wont start up but power is on

    I came home tonight, had left the computer on...it was frozen on the screensavers and the fan was on HIGH...their were running louder then i had ever heard them.
    Shut the power off, wouldnt restart. I tried the new PRAM battery, still wont restart. The power light comes on for only the second it is pushed to turn on the power and if held in to shut down. I got nothing to the monitors but i can hear it come on...no start up noise just the sound of a rev and then silent except for the fans quietly working. If i dont shut it down...the fans rev up til they are super loud. Nothing seems to work to get a display at ALL. I will let it sit unplugged and check it again tomorrow.
    once again...the power light. Only on when pushed or held then it goes off when let go. Thanks for anyones advice. 4+ years old, G5 Dual(non intel of course)

    Same here. Front LED lights for a second. Speaker fan, and CPU fans (front and rear) spin up and seem normal. But the media bay fan (between the optical and hard drives) oscillates--spins up/spins down, but never stops completely. Depressing and holding the power button does nothing; I have top pull the power cord to power down.
    Here's a snip from the Early G5 Dual 2.7 Service Source that seems to capture my problem...
    Power-on LED illuminates when power button is pressed and fans spin continuously but there is no boot tone or video
    1. Reseat video card. (Make sure video card is fully inserted in connector and end of card is secured by the connector latch.)
    2. Verify speaker cable is fully seated.
    3. Reset logic board. Refer to “Resetting the PMU on the Logic Board” in this chapter.
    4. Reseat the processor
    5. Replace the processor
    6. Replace logic board
    I've done 1, 2, and 3 but nothing's been resolved. I'll move on to #4 in the next couple of days.
    However, I'm wondering about the media bay fan. It appears to connect to a sensor. But I can't find any info on it regarding how it's malfunction might affect the rest of the machine. But I assume this fan is powered via the logic board, so maybe that's indicative of my issue? (After all it's #6, above.) Any insights/thoughts out there?
    Thanks

  • Imac screen went dark after power interruption any suggestions?

    My son's imac screen went dark after a power interupption (someone turning the computer off by pulling cord out of electric socket) and I can't get it to go back on.  I've already tried depressing the "command, alt,p and r" keys to get a restart, and while it did restart, still no picture on the screen.  Occasionally you can see white staticy lines, but mostly it is just dark.   I've seen the suggestions to update software and back up data but that isn't possible as far as I can tell because I can't see anything on the screen - it is totally dark!  Any suggestions?  He is coming home from a trip today and hasn't had any access to computer for some time - he is going to freak

    First try iMac SMC and PRAM reset, please do each of them 2x. If that does not work then try restarting in Safe Mode, this will clear some caches. You did not mention the version of OS X running on the machine, if you are running Snow Leopard then install the Snow Leopard disc in the SuperDrive and restart, when you hear the start up tone hold down the Option key and start from the SL disc and run Disk Utility and Repair Disk Permissions & Repair Disk.

  • Can't start up after power failure.

    Greetings.
    Here in the Santa Cruz mountains we experience occasional power outages. After an outage, when I attempt to re-start the computer, it doesn't get past the spinning spokes (or whatever you call that thing). The thing just keeps spinning until I press the power button, shut the computer off, and re-start. After one or two tries, it starts up, but I'd like to know how to prevent the problem in the first place.
    G4 Dual 450   Mac OS X (10.3.9)   1 GB RAM

    The first thing you should do after an abnormal shutdown is boot from your OS X Installer Disc and use Disk Utility to repair both the hard drive and permissions.
    There are two ways to prevent a problem like this:
    1. Buy an external Firewire drive and backup software. Maintain a bootable backup of your system on the external drive. Update incrementally on a regular schedule - Daily for your work files; weekly for the entire system.
    2. Buy an Uninterruptible Power Supply (UPS) with sufficient capacity to keep your system running long enough for you to shutdown normally until power is restored. Usually this means a UPS with enough capacity for about 10 minutes of operating time on battery. Of course you can buy as much capacity as you are willing to spend money for if you want longer operating times during blackouts.

  • Hyper-V - virtual machines don't start automatically after power outage

    Hi,
    I have a HP server running Windows 2012 R2 + Hyper-V. On this server, four VM have Windows Server 2003 R2, and one VM has Windows 2012. After power outage, 1 2003 R2 VM and 1 2012 VM are started properly, but the other three machines aren't. I've started
    it manually. All VM's have last version of Hyper-V integration tools installed, the option "Automatically start VM if it was running before the service was stopped" was chosen. I'm not very familiar with Hyper-V, so, I've investigated only Hyper-V-VMMS
    event log. There are some recurring errors:
    The Integration Services Setup Disk image could not be updated: The process cannot access the file because it is being used by another process. (0x80070020).
    and
    Failed to get the disk information.
    But I think it isn't a clue.
    How can I clarify, why these machines aren't started automatically?

    Hi EugenBerend,
    Maybe it is related to system resources allocation during the start up .
    I would suggest you to configure a startup delay for those lower priority machines so that system
    can locate enough resource for them.
    Hope it helps
    Best Regards
    Elton Ji
    We
    are trying to better understand customer views on social support experience, so your participation in this
    interview project would be greatly appreciated if you have time.
    Thanks for helping make community forums a great place.

Maybe you are looking for