IMac - it won't boot up.

I have a 2 yr. old 23.5" iMac that won't boot up.  Is there a history of power supply failure or mother board failure on these macines?

Have you tried resetting the SMC? Unplug power cord for 15 seconds. Plug back in and then press power button.
Here is the link for info about resetting SMC.

Similar Messages

  • I have an iMac that won't boot up.  I've read all posts on this subject to no avail.  When power is switched on, it chimes, Apple logo appears, spinning wheel, then loading bar starts to fill.  It gets to about 25% then switches off! Help please!

    iMac that won't boot up!   When power is switched on it chimes, Apple logo appears, then loading bar, then spinning wheel.  Bar seems to load up and gets to around 25%, then reverts to the start again, gets to about 20% on the bar and then switches itself off leaving a black screen.  Tried all the remedies on internet with no avail so would welcome some advice other than binning what is a relatively new computer.  Earliest appointment Apple could offer was Thursday 17th, really useful for a business user _ not impressed,

    You've probably tried this, but will it Safe Boot? Restart holding down the Shift key until you see the grey progress bar. You'll need to input your admin password during bootup. If it will boot you can then try to eject the disk using the various suggestions here that you haven't tried already:
    http://osxdaily.com/2009/08/28/eject-a-stuck-disk-from-your-mac-dvd-super-drive/
    Or this (not tried this myself, but if things are desperate): http://www.youtube.com/watch?v=n7NYW9Dr448

  • Upgrade from snow leopard 10.6.8 to montain lion on a iMac system won't boot getting a crossed out circle

    Upgrade from snow leopard 10.6.8 to montain lion on a iMac system won't boot getting a crossed out circle

    Clean install OS.10.6.8 update it completly. May be you ignored some firmware update.
    I have two incedents.
    My thunderbolt port stopped working after upgrading to ML 10.8. I booted from external 10.6 , 10.7 still didnt work. Then i clean installed 10.6.8 and ran software update it updated the thunderbolt firmware and all is well now. This firmware update for some reason didnt show up in ML 10.8.
    Secondly , when i upgraded my Brother's Macbook from 10.5 to 10.6.3 it would install but stuck with crossed out circle. Then i downgraded checked for update found an efi update , then the 10.6.3 worked fine.

  • 27 inch Imac Intel won't boot up. Screen ligthts up, then shows a flashing file folder w question mark. What can I do to find the problem?

    27 inch iMac Intel won't boot up. Screen lights up, then shows a flashing file folder w question mark. What can I do to find the problem?

    Please readd Apple's trouble shooting steps in Flashing question mark appears when you start your Mac

  • IMac 2007 won't boot

    I have a strange problem.
    My 24" iMac 2007 won't boot.  It won't boot either from CD/DVD or anything.  It will display the white screen with the Apple logo, and the spinning wheel under it, until the spinning wheel will stop spinning.  Using my old Linux knowledge, I find that it seems like it freezes on "Login Window Application".  Before this happened the iMac would occationally freeze, creating strange wave-patterns across the screen.
    I have tried the following:
    1) safe mode - same result
    2) reset NVRAM - same result
    3) single user - I can fix the filesystem, delete loginmanager files - same result
    4) boot from Apple CD - same result
    Every time the computer hangs, the strange waves will appear on the screen.  My guess it is the video card that's causing this - and I need to replace it. 
    Can anyone give me heads an idea to confirm my suspicion - or to find the real culprit?
    regards

    OK, thanks, that was a helpful reply.
    Somewhere in my browsing, I gathered that any Mac OS install disk would have the AHT.  After searching around, I found the CD/DVD.
    After extended testing, the AHT says nothing's wrong, but I find two things strange:
    1) the AHT tells me that my memory is 1 GB, while it is 2 GB.
    2) the AHT tells me nothing about my HDD - as if it's not there.....
    I make two conclusions from that;  namely that one RAM block is faulty and the HDD is invisible seen from AHT.  The latter would stress me immensely, if I hadn't seen the entire drive from single user mode before.  There could be some faulty sectors though that would mean that the OS is behaving strangely.
    Please advise on hints on where you would go next - anyone?

  • IMac G5 won't boot from CD drive, Please Help

    My iMac G5 won't boot from the CD drive. There is no operating system on the hard drive so I want to install a fresh copy of Leopard. I have tried a couple different methods, but I keep getting the same end result. The first method I tried was booting from the CD drive by holding the C key during start up. The Leopard disc was automatically ejected after about 20-30 seconds. The second method I tried was booting the iMac to the "question mark file screen," which is when I inserted the Leopard disc. Usually on other Mac computers, this is when the computer will show the Apple logo and prompt you with the installation process. Not this iMac, it just ejects the disc shortly after I insert it. I'm not sure if it's the CD drive that is having the issue, the hard drive, or something else.
    If you have any ideas, they would be greatly appreciated!
    Thank you,
    Chris

    Where did you get the CD from?
    If it is from another Mac, it is probably specific to the hardware in that Mac and is not capable of boot your iMac.
    Allan

  • IMac G5 won't boot up

    My iMac g5 won't boot up. The indicator comes on, but the screen stays black. Help!

    Looks like you have both an Intel and an older iMac G5 PPC. Do you hear the chime on startup?
    The chime is quite meaningful. It means the computer passed the P.O.S.T / Power On Self Test.
    http://www.tuaw.com/2010/10/22/mac-101-whats-happening-when-your-mac-is-starting -up/
    See
    http://support.apple.com/kb/ts1367

  • I have an iMac that won't boot up. Chimes, Gray screen w/ apple icon, spinning gear and progress bar at bottom, about 20 sec then shuts off.

    I have an iMac that won't boot up. Chimes, Gray screen w/ apple icon, spinning gear and progress bar at bottom, about 20 sec then shuts off.
    Please Help

    The internal drive is malfunctioning. What backups do you have?

  • Need Help with iMac 350 - Won't boot - keyboard or mouse not working!

    Hello,
    I've scoured the web looking for answers, and can't find any, so maybe someone here would be kind enough to help. I'm working on an imac 350 blueberry for my sister and I'm having all sorts of trouble.
    She bought it last week, it started up (8.6 os) no problem. Powered up and down a few times, then all of a sudden, it won't boot. I'm currently getting blinking folder/happymac/question mark when trying to start up.
    Here's the big problem - the keyboard and mouse do not work now. I've tried three different mice and three keyboards and no dice with any of them. I have the 8.6 CD from her previous imac (bondi), and I can hear it spinning, but there is no way to start up from cd.
    I've also tried 2 other hard drives with the same results.
    Tried resetting CUDA on logic board, taking out battery, no change. Bought new battery- no change.
    I would love to at least get the keyboard working to see if I can even startup from cd, anyone have any clues on how to get it working? The strange thing is that the keyboard has a power on button, and it works to start the thing up, but dies when it tries to boot. Sometimes I just get a grey screen with the pointer icon, and I can move the pointer with the mouse for a second or two, then no response.
    I appreciate any help or suggestions on locating the issues!
    Thank you!

    When I said "but dies when it tries to boot" and "..then no response." I meant that the keyboard works to power up the computer, but won't work for anything else. So, I am figuring that the usb ports are supplying power to the keyboard and mouse, but the usb ports aren't relaying information from the keyboard or mouse.
    How do you know the mouse isn't working? Won't you have to wait until later in the boot to tell?
    The poweron key is a special case. I think that it works by lowering/changing the voltage on one of the usb cables. I read about this somewhere. Anyway, this function was eliminated from later usb keyboards and macs. Maybe a working power button doesn't mean what you think.
    I would love to boot into open firmware
    Could you try powering up from the machine? Is there a power button on the lower right of the machine?
    Have you tried this key combo?
    commandoption+of
    The letters are in lower case. Hold all down then poweron the machine. I'd poweron from the machine as apposed to the keyboard.
    You could try another usb keyboard.
    We actually did boot up the computer several times with it upside down. Not for any reason, except it's become a real PIA to flip it over every two minutes to start it, then take it apart and boot again. When booting either upside down or right side up it shows the same thing - blinking folder w/finder icon and question mark.
    Yes, I agree. You could try removing the clear plastic around the bottom of the machine. At least you will not have to slide in the carriage. Note. The tv portion will still be surrounded by plastic! Don't remove the plastic around the tv!
    Hope I am not interfering with Richard and his comments.
    Richard: Is this the orginal keyboard? When did Apple get rid of the poweron key from the keyboard? My iMac 600 didn't have the key and my iMac 233 does.
    Robert
    Robert

  • Imac g5 won't boot from any Cd/DVD

    Hey,
    New member here.
    I have an Imac 20" 1.8 Ghz PowerPC G5, running Mac OS X 10.4.9.
    My problem is my computer won't boot from from any DVD or Cd, not the original system disc (10.3.5), not from a newer Imac system disc (10.4.7), not from a Disc Warrior 3.03 disc.
    What I get from the Disc Warrior disc is a gray screen with white letters backed in black, saying
    "panic (cpu 0 caller 0xooze49do): unable to find driver for this platform: "powermac8,1""
    Plus other stuff written underneath it, looking like a log of how far it went.
    When I try to boot from the original 10.3.5 DVD, it does boot up but doesn't work after that - it gets to the language to choose and stops.
    When I try to boot from the 10.4.7 DVD, I get the gray screen, same results as the Disc Warrior cd.
    I even copied my system folder (10.4.9) onto a firwire drive and start from that, but I get the gray screen again.
    I zapped the pram, and reset the Open Firmware - still no dice.
    Can anybody shed some light on this?!?
    Many thanks!
    Rufmanj

    To Apple Discussions.
    Please check out the following thread which the original posted had the same error you had.
    http://discussions.apple.com/message.jspa?messageID=4459207#4459207
    You may find some helpful troubleshooting solutions in the above thread.
    Make absolutly sure you are using the "DVDs" that originally came with the computer.
    Also, see Knowledge Base Article; http://docs.info.apple.com/article.html?artnum=106805 Mac OS X: "Broken folder" icon, prohibitory sign, or kernel panic when computer starts

  • IMac G4 won't boot, go into target mode, or verbose, or single-user.

    Hi, I am completely flummoxed.
    Yesterday I had my iMac G4 networked (via FireWire cable) to my MacBook Pro. I was copying about 14 GB of data from the MBP to the G4. The MBP indicated the copy operation was finished, but the G4 went into a spinning beachball, from which I could not escape -- couldn't force-quit, change applications, open terminal, or anything. So I (reluctantly) did a hard power-down.
    When I went to restart the G4, I got a grey screen of death -- for about 2 minutes. Then the screen goes black for a second, then goes grey again, this time with the alternating folder-and-question-mark icon. Bad news.
    Here is what I have tried so far:
    * Won't boot into target mode -- if I hold down T at startup, the screen stays black (never gets to the grey screen, or to the FireWire icon).
    * Won't boot into single-user or verbose mode -- if I hold down cmd-S or cmd-V, computer stays grey.
    * Won't boot in safe mode -- ditto.
    So my next idea was to try booting from a startup disk. But how to open the optical drive tray? (This is a tray-loader, not a slot-loader.) I pulled down the white external door manually, but do not see an emergency open pinhole inside. But there must be one, right?
    Does anybody have any other ideas on how I can break into this thing, or what might have gone wrong with it?

    So my next idea was to try booting from a startup disk. But how to open the optical drive tray? (This is a tray-loader, not a slot-loader.) I pulled down the white external door manually, but do not see an emergency open pinhole inside. But there must be one, right?
    I'm not at a G4 iMac right now, but other tray-load drives of that generation had a hole but ti's very low in the opening. Probably need a good light to see it.
    Try starting the computer and holding the mouse button down while it's trying to boot. This is a startup shortcut to open the drive but may require that the system start to load, something with which yours is obviously struggling.
    Does the iMac have the original Apple keyboard? Some third-party keyboards may not support the startup combos for safe mode, single-user, etc.

  • IMac G5 won't boot, only White Screen

    I have an iMac G5, no iSight, it won't boot up.  It briefly displays the Folder icon with blinking question mark, then White screen.  The first time it happened, I rebooted from an external Firewire drive, but only once.  When I tried that again, it would not boot. 
    I disconnected all external devices, no boot.
    I can't do Target Disk mode, can't boot from external disk (except that one time-weird exception), can't boot from Install CD.   It WAS Open Firmware password protected, but I can't remember if I disabled it or not agfter my last hardware failure.  (Note to the wise:  if you have an older machine, don't use Open Firmware Password, it can greatly complicate troubleshooting when the inevitable failure happens).
    I MAYBE have Open Firmware password enabled, since I
    However, I CAN boot into Open Firmware (Cmd-Opt-O-F), I did manage to eject the Install CD that was stuck.
    So I opened the back of the iMac.  All three LEDs are good, indicating good power supply.  I reset the SMU using the little button switch, then tried reboot with the little power button switch.  Still no reboot.  I tried re-seating the RAM cards, still no reboot.
    I'm at the end of my bag of tricks.  Does anyone have a suggestion?  Is it a hardware problem?
    thanks from San Francisco

    Well you could try to reset the PRAM, but if your drive is dying it won't help, although it's worth a try.
    You can also try using Disk Utility:
    Disk Utility
    1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
    2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
    Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
    3. Click the First Aid tab.
    4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
    5. Select your Mac OS X volume.
    6. Click Repair. Disk Utility checks and repairs the disk.
    If none of that works, it's time to take it in.

  • IMac G5 won't boot and fan just runs

    I have an older iMac G5 that has always been a little flakey...it would just shut off for no reason intermittently.  For the most part, I could deal with that as this is no longer my primary Mac, but when I did the last iOS update, my external TimeMachine drive started getting errors - won't write because the drive was read only and now, when I turn on the computer, it won't boot...the fan just runs loudly.
    I researched this and tried the following:
    Reset the SMU - didn't resolve
    Unplugged everything and rebooted - didn't resolve
    So I have a couple questions since I'm ready to toss this computerI have a current Time Machine backup, but don't have a machine to restore to
    Is there a way for me to get at the Time Machine backup (I think I can just plug it into another Mac)?
    How can I get my iPhoto, iTunes, iMovie, etc. files off the backup and is there a way to import them into my existing applications on my MacBook Pro?
    Any help would be VERY much appreciated!! 

    You may have the old exchange/repair program power supply capacitor issue on your iMac.  You might be able to find another on my FAQ*:
    http://www.macmaps.com/usedrefurbished.html
    Note, recovering to an Intel Mac directly from Time Machine may not be practical because of various issues with compatibility.

  • Imac g5 won't boot and cd stuck in drive

    please help -
    my imac won't boot up (right now we're assuming a faulty power supply, the original already went and had to be replaced). furthermore, there's a cd i need to get at in the cd drive - is there a manual eject for the 2004 imac g5's?
    thanks!!!

    Welcome to Discussions - What model Mac do you have? You can try lying it face down on a soft towel and pressing the eject button as you try to boot. If you have already had the power supply replaced, call Apple immediately and tell them, they should take care of it.

  • IMac 27" won't boot up

    My 27" iMac won't boot up.
    It switched itself off! Now all I get is the chimes, then the grey screen and then I just get a spinning wheel.
    Recently there appeared a lot of dark marks in the top right quarter of the screen ....... don't know if that's connected.
    Help!

    Thanks for clarifying. It did stick out rather prominently.
    For your issue, I suggest that you <a href="http://support.apple.com/kb/HT1379">Zap the PRAM</a> and <a href=" http://support.apple.com/kb/HT3964">Reset the SMC</a>, then try again.
    If no go, then ontact 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 (might not apply in all details outside the US).

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