HT2452 I cannot boot my imac.

I cannot boot my imac.  It stops booting at the grey apple screen.  I have tried the fsck and if gives me an error "disk0s2:  I/O error"  cannot seem to get it to come back.  any ideas?

Repair the Hard Drive and Permissions
Boot from your Tiger Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
If this doesn't work, and it might not, then you can get Disk Warrior as suggested abob or reformat the drive and reinstall OS X.

Similar Messages

  • Cannot boot 2006 iMac

    Had spinning beach ball.  7 hours still spinning.  Unplugged iMac.  Waited 30 minutes, still will not boot.  Now just have whilte screen with folder with question mark in center.  After a minitue the screen is just gray with nothing on it.  Help?

    I have a similar problem.
    When doing the software update, my computer froze with the kernel panic screen. Now when I boot up, I cannot boot from the CD-ROM drive but I can hold down T and get into Firewire target disk mode.  When I try the OPTION key held down during startup, I get a cursor on the grey screen but no volumes to select.  I have not tried too much else but I think I am gonna swap the hdd out and see if I cannot boot up off the CR ROM then, even though you would think that the hard drive, good or bad, would have nothing to do with being able to boot up off the DVD/CD drive during startup.  Also tried the PRAM trick still the same thing.  I also tried the NETBOOT option and that worked but I dont have an image server on the network. ;(

  • Cannot boot up iMac with 10.6.8 Snow leopard

    iMac 10.6.8 cannot get to boot up.  Had been getting 'startup disks full' but didn't know what to do about it.  Now, it boots up to the blue screen, apple, with the spinning disk, and the horizontal tube marker.  That tube gets about 1/4 inch full, and then erases it - and starts it again, again geting about 1/4 inch full, before it shuts completely down and goes black screen.  All that takes about 3 minutes.
    I tried to hold the shift key down, but doesn't change anything.  I have the original Snow Leopard disc I upgraded from Leopard. 
    Any help would be greatly appreciated!  I am sending this from my older MacBook - also running 10.6.8.

    If you have the Snow Leopard disk start the computer with that disk, insert it into the drive the restart your system while holding down the C key.  Then run disk utility on your hard drive to verify/repair it.  Take a look at his link, http://support.apple.com/kb/HT1782?viewlocale=en_US&locale=en_US

  • My G5 iMac cannot boot up from its hard disk

    My G5 iMac cannot boot up from its hard disk - I get the alternating Mac OS folder and the ? Folder which I understand means the system cannot be found.
    On recommendation from a friend I tried replacing the battery - no difference.
    However, I can boot up from the CD/DVD drive from the OSX installer disk, DiskWarrior, Drive Genius and Techtools Pro. But none of these utilities can see my hard disk to see if it needed repairing.
    In fairness at one point DiskWarrior did see the drive and I was able to replace the directory safely. However, on subsequent reboots nothing can see the disk.
    Suspecting the hard disk I bought a new one and a USB/SATA casing to mount the old drive in to see if I could get anything off of it. The good news so far is that the old drive (now mounted in the new USB casing) can be seen and read on my daughters iMac. So all my information is safe and also now backed up.
    Having installed the new disk I found it also cannot be seen by any of the above utilities. I have since formatted it in the USB casing and put it back in the iMac but it still cannot be seen.
    As a test I installed a new system on an old 40Gig Lacie Firewire drive attached to my iMac. This works and boots ok - sometimes.
    I am now experiencing the necessity to force shutdown and restart from the startup button several times before the external disk is recognised. And most times it freezes after 30 minutes or so.
    I might also add that after some force shutdowns/startup I get little or no chimes. And sometimes when trying to reset the PRAM get no second chime. On other occasions I do.
    Now I am totally stuck and wondering if anyone can throw some light on why my iMac can boot up from a variety of CD/DVD utilities and sometimes an external Firewire disk but not from its own hard disk which, as I have already said, can be seen on my daughter's iMac but not by mine, so its not the disk.
    Does anyone have any suggestions at all before I bite the bullet and take it in for a diagnosis and repair (depending on cost).
    Thanks

    Could be the logic board, in which case you would need to take it in. Since the drives are good, and the directory was repaired, the logic board is about all I can think of.

  • TS1587 My iMac 27" model mid 2010 cannot boot

    My iMac 27" model mid 2010 cannot boot , it shut down after apple logo running a while. It happened after I'd installed ntfs-3G and restart the system

    Please read this whole message before doing anything.
    This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
    The purpose of the test is to determine whether your problem is caused by third-party system modifications that load automatically at startup or login. 
    Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
    Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
    When you see the gray Apple logo, release the shift key.
    If you are prompted to log in, type your password, and then hold down the shift key again as you click  Log in.
    *Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.  The next normal boot may also be somewhat slow.
    The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

  • Cannot boot iMac G5 from original OSX 10.4.2 CD...

    Hi,
    My iMacG5 is currently running 10.5.8 and I want to reformat it. I cannot reboot or even mount the original OSX cd that came with it which is 10.4.2
    Holding down 'c' or 'option' key cannot work as the cd is ejected and when i log in the cd does not mount and is also ejected. cd is good as i can mount it on another mac. CD/dvd reader is good because i can read other cd/dvd
    any idea?
    thx
    JP.

    Hi
    well managed to partially solve my problem after... after visiting an Apple Store in town and talking to a very useful techie staff
    I used my other imac with the OSX 10.4.2 and started it in target firewire mode and booted my old imac with S key (and yes I did manage to find a 400 to 800 firewire cable...).
    Worked like a charm and was able to remotely reinstall everything.
    Still a problem with the superdrive though because although it can read cd/dvd it cannot boot from bootable ones...
    JP.

  • I cannot upgrade my iMac 2009 to snow leopard (it was deleted by mistake) now is running 10.5.8, the snow leopard dvd is not installing and the computer keeps crashing..If anyone have an answer, PLEASE Help me.

    I have a 2009 iMac 4,1  2GHz intel Core duo it says here I have 1GB of memory. I had it running on snow leopard 10.6.8 I still have the SN software that i bought to made the upgrade. Had some guest staying at my place and they deleted the running os and a lot of files and stuff..., now is running on leopard 10.5.8 and it's giving me a lot of problems because is soo obsolete, also hte computer is crashing all the time and every time I try ti install the SL dvd, the computer won't read the dvd and I'm keeps booting me off. Is not getting better at all and now when I restart the iMac before I get the grey apple screen, the folder of death icon flashes, (I already lost my Macbookpro due this situation. What can I do to resolve this aggravating and frustrating Issue. Need help now ..Please

    Before we get too far, please clarify this part:
    I have a 2009 iMac 4,1
    A 2009 iMac cannot be an iMac 4,1; they are 9,1 and higher. Did you mean to type "2006?" That would be an iMac 4,1. We need to pin down the model issue before proceeding.
    It could be the drive, not the disk, that is dirty. Try a drive cleaning disk, usually about US$5-15 at home entertainment, electronics stores and office superstores

  • Apples update didn't work for me: Boot Camp: iMac displays a black screen during installation of Windows 7

    Boot Camp: iMac displays a black screen during installation of Windows 7 - Apple Support
    I have followed each of the steps listed in the link above with no success.
    Prior to adding the extra drivers I was able to start the Windows install process up to reformatting the "Windows" Bootcamp drive. After that the computer would go through some instal processes and eventually restart. After the restart the screen would go black. The black screen lead me to the  Apple Support link above dated March 5 2015. After going through steps listed in the link above, I get an error message stating that the D:\Sources\instal.win. file cannot be located. I am forced to restart the computer at that point and theWindows install process attempts to start again but always ends up at the same point.
    Note: I am installing windows 7 Pro from a DVD. I scanned the AutoUnattend.xml file and noticed that it refers to "Windows 7 ULTIMATE" but not "Pro" or any others that I could see. (see below). Could that be part of the issue?
    Any feedback would be greatly appreciated.
    <cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 ULTIMATE" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
    </unattend>
    iMac (27-inch, Late 2009)
    2.66 GHz Intel Core i5
    16 GB 1067 MHz DDR3
    ATI Radeon HD 4850 512 MB

    Here is an over-simplified explanation of WIM and CLG files. Assume your DVD Media contains
    W7- Ultimate
    W7- Professional
    W7- Home Premium
    W7- Home Basic
    WIM Files
    File1
    y
    y
    y
    y
    File2
    y
    y
    y
    y
    File3
    y
    File4
    y
    y
    File4
    y
    y
    y
    The File .wim will contains a compressed image which contains File [1...5].
    The W7-Ultimate .clg will have 5 entries, with all set to 'Y'.
    The W7-Professional .clg will have 5 entries, with 'Y','Y','N','Y','Y'.
    The W7-Home Premium  .clg will have 5 entries, with 'Y','Y','N','N','Y'.
    The W7-Home Basic .clg file will have 5 entries, with 'Y','Y','N','N','N'.
    This allows a single .wim Image file on the DVD media to be used to install any of the 5 flavors of Windows. When you enter your product key, the Installer knows what specific W7 variant you have the key for and will tell the WIM to extract the specific files the installer needs to be extracted.
    The following line
    <cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 ULTIMATE" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
    is telling that a retail product key will be entered, which should go look for this specific .clg file (from the five you already have on disk).  You can test if it will work for you by changing this line to the following
    <cpi:offlineImage cpi:source="wim:d:/sources/install.wim#Windows 7 PROFESSIONAL" xmlns:cpi="urn:schemas-microsoft-com:cpi" />
    If it does not work, the other issue can be related to device discovery. Typically A: and B: device names are reserved for Floppy Drives. C: is your internal HDD.
    D: can either point to the Optical drive, or the USB. The normal convention is that the removable media is named from Z: backwards. Y: and Z: are usually used for Network drives, so X: should be your USB. First try with the change to "Professional". If it does not work,

  • Cannot boot into mountain lion after I have set the start volume to CD drive

    Previously I need to boot from CD so I have set the start volume to CD drive by pressing command+option+P+R at the same time and change the start up volume to CD drive.
    But right now, it can just start from CD but cannot boot into Mac OS (Mountain Lion) which is installed in the hard disk.
    I have tried to press command+option+P+R at teh same time during bootup but seems like right now it doesn't recognize this command.  I have tried pressing "X" or "option" or spacebar, etc during bootup but still it tries to boot from CD. 
    Anyway I can change the start volume back to my internal hard disk?
    I have even disassembled my iMac and the CD drive to remove the previous CD as well.  Then it still tries to boot from CD drive but now saying the device is not bootable and ask me to insert a bootup disk.  I then tried to put the Mountain lion installation DVD (I previously created the installation DVD by following the DIY way from this link http://www.cultofmac.com/180925/how-to-make-a-bootable-disk-or-usb-drive-of-os-x -mountain-lion/) there in the drive but it still said the device is not bootable. 
    I have disassembled my iMac again to remove the mountain lion disk right now.  So the CD drive is now empty.  Anyway I can change the start volume back to my internal hard disk?
    This is really frustrating .. Hope someone can help.
    thanks!

    Have you ejected  the CD/DVD by holding mouse button on bootup?
    Have you done a PRAM reset, CMD+Option+p+r...
    http://support.apple.com/kb/HT1379
    In fact, do 3 in a row, takes a bit of time.
    Intel-based Macs: Resetting the System Management Controller (SMC)...
    http://support.apple.com/kb/HT3964

  • Grey screen from power up - OS is booting though - iMac (20-inch Mid 2007)

    Hello good people...
    I'm really in need of help here. I'm pretty stuck. I've got a iMac (20-inch Mid 2007) and the screen is staying grey nothing more. From the moment it's turned on the grey screen appears and nothing else. I can hear the HD and other internals booting. I've booted from this iMac to my MBP and it boots it fine, it gets to the desktop and everything is working normally. So it would appear to be hardware.
    I've replaced the inverter and the same occurs....
    I've purchased a new LCD but that hasn't helped. It stays black at all times. Model of original LCD is AU M201EW02 V.B Model of replacement I purchased isM201EW02 V.9
    Any ideas ?
    Thanks in advanced.

    Hi and welcome...
    It may be something besides the display.
    Boot from your install disc, run Disk Utility to verify and if necessary, repair any errors on the startup disk.
    Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
    Go to Installer menu and launch Disk Utility.
    (In Mac OS X 10.4 or later, you must select your language first from the installer menu)
    Select your HDD (manufacturer ID) in the left panel.
    Select First Aid in the Main panel.
    (Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
    Click Repair Disk on the bottom right.
    If DU reports disk does not need repairs quit DU and restart.
    If DU reports errors Repair again and again until DU reports disk is repaired.
    When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
    Select your start up disk and click Restart
    While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. *Make sure there is always 10% to 15% free disk space*
    If you cannot boot from your install disc, try booting in Safe Mode
    What is Safe Mode
    Carolyn

  • Yosemite cannot boot (Freezes) even with Clean Install

    Macbook Pro 15" was normal in the normal, but I updated Samsung Kies and it told me the restart, after that I cannot boot up Yosemite 10.10.2 at all
    What I've done:
    1. I can access Target Mode with my iMac, copied my files with no problem. I used my imac to verify both MBP HDD and Bootcamp and even try repairing, it showed that there was no fault at MBP in the first place.
    2. I can enter Safe Mode, I tried updating the OSX to 10.10.3 and still does not work
    3. Bootcamp windows got bluescreen, removed it still doesn't help.
    4. I tried install a Clean Install, and still doesn't work, (Installed through SD Card)
    5. It seems now I can only do ie., continue my update, continue my new install through safe mode ONLY
    I never turned on Filevault in the first place.
    At this point I'm not so sure, if I can still access through Target Mode, hopefully it should mean that my hard disk isn't broken.
    I am out of ideas... please help
    Ps. at normal Start up from the progress bar sometimes the screen stutters and showed me a pixelated screen and then switched back to the progress bar after a minute the loading circle appears and the looping appeared overlapped and thickens

    Startup Issues - Resolve
    Startup Issues - Resolve (2)
    Startup Issues - Resolve (3)

  • CDBOOT: Cannot boot from CD - Code: 5

    When I attempt to boot from my Windows 7 install disc, I get this message on a black background:
    CDBOOT: Cannot boot from CD - Code: 5
    I'm using a late-2008 13-inch aluminum MacBook running OS X 10.7.
    I've attempted burning the install .iso file multiple times (creating a couple of useless DVDs) at the slowest speed possible (which seems to be 2.4x, according to Disk Utility), and that has not solved the problem.
    I haven't been able to find any help on this issue for a Mac user who doesn't already have Windows installed. (There seem to be solutions for people who are already running Windows).
    Can anyone help?

    Hi,
    I had the verry same problem and I did multiple things I thought that could fix this problem.
    Point one, the burning speed has nothing to do with the quality of your boot disk, you only have to lower burning speed if your burning process fails. So remind this for future burning problems.
    1: I did the Lion software update.
    2: I got another .iso file, burnd it and made a new partition in bootcamp and ran the setup again.
    This time it worked really fine. But I'm not shure wether it was the SU or the new .iso... I checked the SU summary for the lion system update, but there was nothing to find on a boot camp bug and since they've improved boot camp it should work better  
    I have a 27" imac with the 2TB drive and Solid state so I was thinking that maybe it depended on which fysical drive I made the firtual bootcamp drive. But I tested the new W7 Boot disk on both fysical drives and it worked on both.
    UPDATE: I found the reason... I compared the two copies of windows 7 boot disks and the one that works had a different name... Your boot disk should be called "CD_ROM" if not, the bootsequence will not recognize your DVD as a CD which appears to be nescesary for the installation process.
    Sorry for the incomplete english, I'm from Belgium.
    Message was edited by: Lonely Alien

  • IPhone and iPad cannot connect to iMac

    I'm having trouble connecting my mobile devices to my iMac using Edge Inspect. Edge Inspect is running on my machine and in the browser (the icon is illuminated in the Chrome taskbar), but when I try and connect my iOS devices via the Edge Inspect app on each one, they cannot see my iMac and any attempts to use 'Manual Connect' (with any of the 3 IP addresses shown in the Chrome plugin's menu box) result in an error message:
    "Connection unsuccessful, please try again."
    I've got the latest versions of iOs and the Edge Inspect apps running on my iPhone and iPad, OS X 10.8.3, Chrome 26.0.1410.65 with the Edge Inspect plugin and the latest version of the Edge Inspect app running on my iMac, and have verified that port 7682 is open on my iMac. Edge Inspect is shown as allowing incoming connections via my firewall. I've tried restarting the Mac, to no avail.
    TL;DNR: I've tried everything that I can find online to get the application to work, but my devices can't 'see' my iMac. Can anyone help?
    (If it matters, I'm running a BT Home Hub 3.0 for my home network.)

    Fixed the problem - all I needed to do was power cycle my router. Schoolboy error!

  • Macbook Pro4.1 Cannot Boot Up After Battery Allowed to Drain.

    I’m hoping someone can help me troubleshoot some strange behaviour of my Macbook Pro4.1. It’s an early 2008 2.4Ghz Core 2 Duo. I’ve had this running perfectly for the past 2 months with an Apple 65W Magsafe Adaptor, although I recently got an 85w version so I’ve started using that for a bit. I recently read somewhere that it’s good to allow the battery run completely flat once a month or so, so I unplugged the adaptor last week and ran it off the battery for the afternoon. When it was almost done (10% charge left) I went for a shower and came back to find the Macbook powered down. I plugged in the Adaptor back in but I couldn’t get it to start.
    I have to say at this point, that my 85w adaptor sometimes needs a wiggle at the magsafe end to get it to work. Despite this though I couldn’t get the green power LED to light or the Macbook to boot up. I then tried my 65W adaptor, which is perfect, and although the LED lights up (first green and then amber) the macbook just doesn’t power up with it. I tried the 85w one again the following day after leaving the macbook disconnected and battery removed overnight, and was pleased to find that it finally booted.  Amazingly, despite having no power at all for the whole night it came back with all my applications running, safari tabs and the documents open! Anyway, I noticed from the menu bar that the battery was not charging and I couldn’t seem to get it to charge. I ran it all day and the system profile showed that the Battery was about half full and had a ‘normal’ condition with about 187 charge cycles. However I can’t run the Macbook off the battery. When the power cuts out from the 85w adaptor the whole macbook shuts down. The battery isn’t doing anything, even after charging all day and being half charged. What’s more neither of my 65w adaptors can start the macbook no matter how many times I try them. Only my 85w one can boot it, but it’s defective so very rarely seems to work. The 65W ones worked perfectly before,so I don’t know what’s changed.
    I read the Apple guide to resetting the SMC and have now followed the procedure several times, but it hasn’t helped. I cannot boot the Mac any more. Does this Macbook come with an 85w adaptor or 65w? I’m confused because the 65w ones always worked until now. Also, the battery itself is only 60w.
    I’m going to purchase another 85w Adaptor, in the meantime any advice would be very welcome. Thanks for reading!

    Thanks again for all the input, very much appreciated.
    So, in case of any misunderstanding, both my 60w Magsafe Chargers are perfect. I use them with other MacBooks. No problem. I also used them with this MacBook, prior to the battery going flat. Again, no issues. Despite that, even when I've completely removed this battery and tried to boot the Macbook up from just the chargers, nothing happens at all. There is no power. I've reset the SMC which is the obvious culprit. Still nothing.
    The only charger I have which can start it is an 85w one. However that's defective, so I don't get a connection long enough to complete a bootup. The question is, is this normal? Should this MBP only work with an 85w and not a 60w?? And if that's the case, how come it worked on a 60w charger for so long? And why is the battery 60w and not 85w?
    thanks again

  • Cannot boot itunes after 10.1.2 upgrade.

    Hello there..I had itunes 10.1.1 running fine on my XP - apple updater told me there was a new version (10.1.2) so I upgraded...did the install and now I cannot boot itunes from desktop or anywhere else...tried uninstalling and reinstalling but no luck...no messages, no errors just...no itunes.
    Do you think you can help or anyone else who reads this?

    I Finally got mine working correctly. I have windows 7 64 bit. I uninstalled everything and reinstalled using the 64 bit. It works now. I don't know if the automatic update selected the 32 bit to update. I rechecked the system requirements, it looks like itunes no longer supports the 64 bit xp system--if that's what your is. I would look into that, and maybe downgrade to the olde itunes.

Maybe you are looking for