IMac won't boot anymore after power cut

Thanks to the great storms in New Jersey, my iMac does not boot anymore after a power cut. Does not get past the apple logo screen with the spinning wheel and keeps rebooting every 2 minutes.
I was able to mount the HD via Firewire on a host machine and the disk seemed fine.
I booted from the Install disk and ran Disk Utility - seemed fine though I could not verify the disk permissions ?
One other thing - I seemed to remember the white light (front bottom right) was blinking before during start-up. Now it goes and stays black after couple of seconds.
Help please,
Philippe

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?
Carolyn

Similar Messages

IMac won't turn on after power cut

When my iMac is unexpectedly turned off, ether at the wall or during a power cut, it won't then come back on immediately. Sometimes it will come back on after an hour, sometimes after a couple of days. Anyone know why this is? There is no logic to it. I've tried all the trouble shooting stuff; the resetting SMC for example. And I've got a surge protector. I've also taken it into an Apple store, a round trip of 3 hours, twice already over the past couple of months. But after doing some diagnostic tests on it they can find nothing wrong. Also, when they go to turn it on, it fires up immediately. I was told that unless they experience the problem themselves they can't do anything. Which means I'm forever taking it in to them, during this problem, on the off chance it may still be a problem when I get there. It's very infuriating. Help!!!

Great advice. And I'll definitely do that - need to get my Mac back on and working before that however.

Won't boot anymore after nvidia-xconfig

Hey Guys,
Got a problem with my Arch Linux here, hope you can help.
Today I tried to install the official Nvidia Driver and BumbleBee following along the great Wiki on this topic.
Everything worked just fine and I also could run optirun gfxgear or somemthing like this.
I wanted to switch to the Nvidia Settings in the settings menu and it told me to configure my xconfig and restart x so I typed nvidia-xconfig in the terminal and it gave me an success output.
I restarted my system and now it hangs on the graphical thing I think. It won't boot anymore.
Hope you can help me out.
Thanks alot
Edit: My Nvidia Card is a Nvidia GT 740M if this matters
Last edited by Whitz (2015-02-09 11:02:41)

No, I have a laptop with 2 graphic cards an intel hd4000 and a nvidia gt 740m.
I ran the Arch Linux installation well until I tried to get the nvidia gt working with bumblebee.
I followed the wiki of the bumblebee topic and it worked well. I wanted to switch into the nvidia settings and it told me my x isnt configured properly and I should type nvidia-xconfig and restart X.
After the restart it won't boot to the graphical interface anymore.
Hope this cleared up the things
Also I dont get any errors but it just wont load..
Last edited by Whitz (2015-02-09 12:08:49)

Btrfs: System won't boot anymore after unclean shutdown

Hi,
I have a problem with my ArchLinux (kernel 3.19.2-1-ARCH).
I have my root partition as BTRFS and no /boot partition.
After an unclean shutdown the system won't boot anymore.
GRUB loads the kernel and the kernel starts but it hangs saying: Mounted /dev/sda3 on real root.
Then, I have to start a Live CD and do:
btrfsck /dev/sda3
After that the system boots correctly.
I've tried adding fsck to the HOOKS in the mkinitcpio.conf file and in fact it tries to fsck the filesystem (but with BTRFS, fsck.btrfs doesn't work...)
What can I do?
Thanks

I'm also having this problem. I tried booting up the netinstall image to debug it, but I can't mount my btrfs volume from there either: mount just hangs. After a while, the kernel goes:
[...] INFO: task mount:612 blocked for more than 120 seconds.
[...] Not tainted 3.19.2-1-ARCH #1
[...] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[...] INFO: task btrfs-transacti:636 blocked for more than 120 seconds.
[...] Not tainted 3.19.2-1-ARCH #1
[...] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
From this post I guessed that I might just need to wait so that I could defrag the volume once it was mounted, but it's been hanging for over 15min now (the message above continues to come up periodically).
Like the OP in the thread I linked to above, my btrfs volume is inside an LVM volume (which is on dm-crypt). Don't know whether that's relevant.
Output of btrfs-check:
Checking filesystem on /dev/pixie/btrfs
UUID: e04cc661-e31a-4dbf-870d-664bc913e34a
found 76855677062 bytes used err is 1
total csum bytes: 72928436
total tree bytes: 2092515328
total fs tree bytes: 1888452608
total extent tree bytes: 104644608
btree space waste bytes: 357251032
file data blocks allocated: 181197139968
referenced 109440282624
btrfs-progs v3.19
dmesg output:
[ 36.824998] Btrfs loaded
[ 36.826713] BTRFS: device fsid e04cc661-e31a-4dbf-870d-664bc913e34a devid 1 transid 98618 /dev/dm-3
[ 46.219014] BTRFS info (device dm-3): disk space caching is enabled
[ 46.259830] BTRFS: detected SSD devices, enabling SSD mode
[ 240.333313] INFO: task mount:539 blocked for more than 120 seconds.
[ 240.335542] Not tainted 3.19.2-1-ARCH #1
[ 240.337795] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 240.340263] mount D ffff8800cf2837f8 0 539 453 0x00000000
[ 240.340277] ffff8800cf2837f8 ffff8800cf2331b0 0000000000013f00 ffff8800cf283fd8
[ 240.340286] 0000000000013f00 ffffffff81818540 ffff8800cf2331b0 ffff8802094f67a8
[ 240.340291] 0000000000000004 ffff8800cf283758 ffffffffa0a2fc91 ffff8802094f67a8
[ 240.340298] Call Trace:
[ 240.340335] [<ffffffffa0a2fc91>] ? set_extent_buffer_dirty+0x71/0xc0 [btrfs]
[ 240.340357] [<ffffffffa0a05796>] ? btrfs_buffer_uptodate+0x56/0x80 [btrfs]
[ 240.340366] [<ffffffff8155e999>] schedule+0x29/0x70
[ 240.340389] [<ffffffffa0a47745>] btrfs_tree_lock+0x65/0x200 [btrfs]
[ 240.340396] [<ffffffff810b4380>] ? wait_woken+0x90/0x90
[ 240.340410] [<ffffffffa09e5cd9>] btrfs_search_slot+0x799/0xaa0 [btrfs]
[ 240.340425] [<ffffffffa09e79f5>] btrfs_insert_empty_items+0x75/0xd0 [btrfs]
[ 240.340446] [<ffffffffa0a47a37>] btrfs_insert_orphan_item+0x67/0xa0 [btrfs]
[ 240.340465] [<ffffffffa0a4a12e>] insert_orphan_item+0x5e/0x90 [btrfs]
[ 240.340482] [<ffffffffa0a4c531>] replay_one_buffer+0x361/0x380 [btrfs]
[ 240.340504] [<ffffffffa0a2f244>] ? alloc_extent_buffer+0x34/0x370 [btrfs]
[ 240.340523] [<ffffffffa0a488f3>] walk_down_log_tree+0x1d3/0x410 [btrfs]
[ 240.340540] [<ffffffffa0a48bfb>] walk_log_tree+0xcb/0x1d0 [btrfs]
[ 240.340558] [<ffffffffa0a507f7>] btrfs_recover_log_trees+0x1e7/0x490 [btrfs]
[ 240.340575] [<ffffffffa0a4c1d0>] ? replay_one_dir_item+0xf0/0xf0 [btrfs]
[ 240.340596] [<ffffffffa0a08b3e>] open_ctree+0x17ae/0x2030 [btrfs]
[ 240.340609] [<ffffffffa09dd633>] btrfs_mount+0x843/0x920 [btrfs]
[ 240.340618] [<ffffffff8117b7aa>] ? pcpu_alloc+0x35a/0x680
[ 240.340628] [<ffffffff811d5d68>] mount_fs+0x38/0x1c0
[ 240.340634] [<ffffffff8117bb05>] ? __alloc_percpu+0x15/0x20
[ 240.340641] [<ffffffff811f116b>] vfs_kern_mount+0x6b/0x120
[ 240.340647] [<ffffffff811f4184>] do_mount+0x224/0xb40
[ 240.340653] [<ffffffff811f4dae>] SyS_mount+0x7e/0xe0
[ 240.340661] [<ffffffff81562809>] system_call_fastpath+0x12/0x17
[ 240.340671] INFO: task btrfs-transacti:561 blocked for more than 120 seconds.
[ 240.342927] Not tainted 3.19.2-1-ARCH #1
[ 240.345175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 240.348473] btrfs-transacti D ffff88020b88bd98 0 561 2 0x00000000
[ 240.348483] ffff88020b88bd98 ffff880211edc590 0000000000013f00 ffff88020b88bfd8
[ 240.348491] 0000000000013f00 ffff8802162289f0 ffff880211edc590 ffff8802094a70c8
[ 240.348496] ffff8802094d8000 ffff880200000000 ffff8802094d8000 ffff880200000033
[ 240.348501] Call Trace:
[ 240.348511] [<ffffffff811b5d1a>] ? kmem_cache_alloc+0x16a/0x180
[ 240.348525] [<ffffffffa09e07ca>] ? btrfs_free_path+0x2a/0x40 [btrfs]
[ 240.348543] [<ffffffffa0a64213>] ? __btrfs_run_delayed_items+0xf3/0x1d0 [btrfs]
[ 240.348550] [<ffffffff8155e999>] schedule+0x29/0x70
[ 240.348568] [<ffffffffa0a0b555>] btrfs_commit_transaction+0x2a5/0xbe0 [btrfs]
[ 240.348573] [<ffffffff810b4380>] ? wait_woken+0x90/0x90
[ 240.348590] [<ffffffffa0a06fc5>] transaction_kthread+0x1d5/0x240 [btrfs]
[ 240.348605] [<ffffffffa0a06df0>] ? btrfs_cleanup_transaction+0x5a0/0x5a0 [btrfs]
[ 240.348611] [<ffffffff81091748>] kthread+0xd8/0xf0
[ 240.348617] [<ffffffff81091670>] ? kthread_create_on_node+0x1c0/0x1c0
[ 240.348624] [<ffffffff81562758>] ret_from_fork+0x58/0x90
[ 240.348629] [<ffffffff81091670>] ? kthread_create_on_node+0x1c0/0x1c0
Last edited by ouroboros8 (2015-04-02 12:37:25)

IMac won't boot up after latest update. Any suggestions?

I just updated my software (the latest from apple), then my iMac won't boot again.

There you go. Your HDD is failing hence its not booting. You need reformat the HDD
To reformat, same steps: Boot to the install disc > get past the language selection > You will see Welcome to Blah Blah Blah > just hit continue > There should be something there called erase and install
BUT
1. if you are absolutely sure that Time machine has BACKED-UP all of your files then proceed above
2. If not, if you have another mac: connect it via firewire then google Target Disk mode. Basically you want to copy all your files from the damaged machine to the new mac to serve as a backup
3. if yo dont have another mac: get an external HDD, install Mac os X on it, boot to it then back up your files
to do this
a) Plug external HDD
b) Boot to the CD restart and hold C
c) Get past language selection and keep hitting continue
d) when it asks you where you want to install Mac os X > select the external HDD
e) once its installed. Restart the computer and hold "Option" key. You should now see your external HDD as one of the boot drives. Select that and you'll boot into it
f) once inside the external HDD OS, you will see the internal HDD(damaged drive)browse/navigate through it and start getting your important files

IMac won't boot up after Lion 10.7.4 update

I made the mistake of updating my mid-2010 27" iMac earlier this week and now it won't boot up. It gets to the gray screen with the Apple logo and the progress bar to finalise the update, but the computer shuts down about 25% of the way in. Fortunately I could boot up to the recovery HD and was able to copy my files over to an external hard drive.
I have a Genius Bar appt today to get it looked at, but wanted to post this in case anyone else had this problem.

Try turning off the computer with the power button, then turn it on to allow it to restart.

Imac will not boot up after power failure

Does anyone know why i have to unplug the power cable from the back of my imac after every power failure at my home to get the imac to boot up. I've tried resetting the surge protecter and unplugging there. However, the only option is to unplug the cord from the back of the monitor/imac before it will boot up. Any ideas or is this a known bug.

You're effectively resetting the SMC.
If you're getting that many power outages you need to be using a UPS (Uninteruptible Power supply), not just a surge protecter.
Power interruptions at the wrong time can cause directory damage or even physical damage to the Hard Drive if the heads were reading or wriing at the time.

IMac won't boot up after install of latest Mountain Lion update

I installed the recommended software update to Mountain Lion last night on my 27" i3 iMac (8 GB RAM).
When I tried to boot my iMac this morning the "install updated software" pane was visible and it note that the installation would be "less than a minute" before it was completed. After half an hour I left for work.
Am I alone on this and what is a possible rememdy?

Try turning off the computer with the power button, then turn it on to allow it to restart.

My iMac won't boot anymore

I've been using a 27" iMac since Octobre 2011 with a Lion/Windows 7 dual boot. It's always worked great, until yesterday: I couldn't boot into Windows 7 anymore, it wouldn't move past the drive selection screen that you get when you hold Option during startup. Lion worked fine, though, so I made an image of the Boot Camp drive, reformatted the partition and put the image back. This did not seem to solve it, so I decided to try a fresh Windows install. I let the Boot Camp-helper app create a disk with the needed drivers and partition the hard disk drive, but when rebooting I got stuck on a grey screen again. I managed to get the Windows 7 install disk out again by holding the mouse button at start-up, but now I can't boot into either Windows 7 or Lion. And to add another layer of tragedy: my Time Machine drive died last week and my replacement is still in the mail, so I have no recent TM backup.
What can I try to fix this?

Sorry if I sounded snippy, I'm just really getting tired of this, and I don't want to send it into the store yet because then I can't work anymore.
Superdrive seems to work fine, according to the handful of other discs that I tried. I'm going to check if I can make a copy of my Win7 disc, just in case it's something with the disc itself (but that still wouldn't explain why I can't get past the grey boot screen).
Oh, and I tried manually selecting the install disc but nothing, it just freezes up again.

Help! Imac won't boot anymore.

Hello. I am in DESPERATE need of your help. I have mac os x leopard and yesterday i update it, but the power went out in the middle of the update. now when i start it it just shows the apple icon and the small rotating wheel.
When i boot up in the Verbose mode, it just goes "Server: mdsync launch failed: (ipc/send) invalid destination port" and then 3 or saved crashreports with the loginwindow and a bunch of nubrs.
Its stuck in this loop and it just goes on and on.
I tried booting up with the cd it came with, but no help, disk utility AND fsck said its ok, in safe mode it dose not want to boot, it just stays in that grey apple rotating wheel screen.
I tried instaling it again, but with the UPGRADE feature, because i have lots of data on the machintosh HD main drive in some folders, and not in a user folder or such, so i can't use the archive and install, because i will lose all data.
Please help!
Thank you,
Sebastian

You can use Archive & Install. This moves the System folder to a new folder called Previous Systems and installs a new one. Other folders that exist on the drive won't be affected. Nothing is deleted in an A&I, only moved.
As a matter of tidiness, it isn't a good idea to have folders sitting loose in the root of the drive. You are much better off having them in a User folder; either your own or the Shared one.
I recommend an Archive & Install, as you have undoubtedly corrupted your OS when the power went out. You may have to reinstall some apps, but your Mac will boot.

IMac won't boot up, after Disk Utility

I was running onyx and it said to run my osx install disk and use disk utility and the repair disk function, so I did. There was an error message like node error and wouldn't get past checking catalogues before stopping. So I quit that and just tried to reboot, but it wouldn't work, just stuck at the apple logo and spinning circle. Is there anyway to fix this?
21.5" iMac Mac osx 10.6.5

Reinstall OS X which will not erase your drive.
Reinstall Snow Leopard
Booting From Snow Leopard Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.
Repair the Hard Drive and Permissions then Reinstall
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. Complete the OS X installation. If you have a good Time Machine backup then select the option to Restore from a TM backup in the installer's Utilities menu.
If DU reports errors it cannot fix, then you will need to reformat the drive and reinstall Snow Leopard from scratch.

My MBP won't boot anymore after "repair disk" and "repair disk permission"

My 2011 MBP 15 with Lion stopped working after I attempted to use Disk Utility to "repair disk" and "repair disk permission".
It was having weird issues before I attempted the repairs, it was freezing every few seconds no matter what I am doing, the whole thing would freeze with only the mouse movable. then after a few seconds it goes back to normal again. This happened after I downloaded and installed some updates from Apple. I don't know if the updates would cause this or it's something else.
In Disk Utility, "Repair Disk Permission" took 5 hours. While "Repair Disk" resulted in "Disk utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed up files".
Now when it boots, there's a loading bar under the Apple logo, it loads half way and shuts down itself.
I can still get into CMD+R Utilities though.
Any idea how I can extract the data out of the disk? I'm going to format and do a clean install.

mike2016 wrote:
This happened after I downloaded and installed some updates from Apple. I don't know if the updates would cause this or it's something else. Now when it boots, there's a loading bar under the Apple logo, it loads half way and shuts down itself.
A stopped loading bar is indicative of a failed firmware install that didn't complete, it's trying to install and is failing.
Do a PRAM reset
https://support.apple.com/kb/HT1379
Reboot into Safe Mode, (shift key down) then reboot normally and see if that fixes the issue.
https://support.apple.com/kb/TS2570
You may have to try to reinstall your firmware manually, you'll need another disk burning Mac
Find your exact firmware(s) here (or on Apple Downloads page)
https://support.apple.com/kb/HT1237
Apply instructions here
https://support.apple.com/kb/HT2213
Lastly it could be your boot drive is failing or something wrong happened with the update and accounting for all the to the other issues.
A OS X "overwrite" may solve the issue, may not.
See 10.5, 106. 10.7 OS X "overwrite" here
https://discussions.apple.com/message/16276201#16276201

IMac won't boot up after latest update

Hi
I'm a newbie to this forum but any help would be greatly appreciated please
We've had our iMac for 2yrs now no issues but when I went to do the latest update today it's gone a bit weird!
I did the install and relaunch like I always do but when rebooting it got stuck on the white start up page with the apple logo and a circular timer
Ive rebooted it several times and performed a PRAM and SMC reset but still same issue. The fan started to run fast but the resets seem to have solved that?
Any ideas what's wrong and how to fix it please?
Thanks in advance

The reason Allan was asking what update is this will affect how it's handled. However without knowing I believe the most wise thing to do it take the machine into an Apple Store or AASP where they can help you. One of the most recent updates was a EFI update for 2011 iMacs. If your iMac is a 2011 machine (released after May 2011) and that is the update in question then the only recourse is taking it in as mentioned.
There are a couple of things you can try though, first is restart using the Install Disk or if you are on Lion restart and when you hear the startup tone hold down the Option Key. Then choose Disk Utilities and run Repair Disk Permissions, do this 2x. Then exit DU and try to restart normally. If that doesn't work then try rebooting in Safe Mode, this will clear some caches. It's possible one or more has become corrupt. If neither of these work then definetely take it in.
Finally please please please complete your profile, use Your Stuff in the upper right of this page then click Profile and complete. This is vital to helping you. At this point we know nothing about your system, what version of OS X, which iMac, etc...

My iMac won't turn on after power flickered on and off.Is there a virus affecting it or is something ele wrong?

My iMac was on and we had our power flicker because of weather conditions. I know the computer is hooked up right because it was on before the power went out.So my question is, is there a virus that had been affecting it before it went off, or is the power button broken? And any help would be appreciated because we have just taken in other computers for various reasons and we really don't want to take it in again.Oh, and i don't really know which model it is. Thanks

Try an SMC reset - sometimes works:
SMC Reset
Shut down the computer.
Unplug the computer’s power cord and disconnect peripherals (printers/external hard disks, etc. but not keyboard or mouse).
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.

Sol10 won't boot anymore after patching

Hi,
I tried patching (Recommended patches of 1/1/2008) an old Netra T1 running Sol10 while running in multi-user mode (yes, I'm that stupid). Unfortunately when I rebooted the server it won't come up again all I get is:
Netra T1 200 (UltraSPARC-IIe 500MHz), No Keyboard
OpenBoot 4.0, 512 MB memory installed, Serial #51796331.
Ethernet address 0:3:ba:16:59:6b, Host ID: 8316596b.
Executing last command: boot disk
Boot device: /pci@1f,0/pci@1/scsi@8/disk@0,0 File and args:
SunOS Release 5.10 Version Generic_127111-05 64-bit
Copyright 1983-2007 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
/kernel/fs/sparcv9/specfs: undefined symbol 'stralloctty'
WARNING: mod_load: cannot load module 'specfs'
(Can't load specfs) Program terminated
ok
Trying a 'boot disk -s' or 'boot disk -r' doesn't make any difference.
Unfortunately the server is located in another country so booting from cdrom is not an option. I only have serial and network access (limited by a firewall that I don't control so remote booting is not an option either).
Anybody any idea how I can boot my server?
Thanks in advance,
Nico

I think a call to Sun is in order... however I do have a long shot you could try (at your own risk or course :) )
I checked a Solaris 10 system and confirmed that stralloctty is used by specfs (sparcv9)
I then check the 32-bit version on specfs and it doesn't use stralloctty...
You could trying booting the server in 32-bit mode instead of 64-bit while this wont solve the problem is may let you boot so you can fix it....
"........To get the image to install switch the machine to 32bit mode (not supported for newer machines). To set the mode, halt the machine and at the ok prompt type setenv boot-file kernel/unix
To change the machine back to 64bit mode type the following at the ok prompt: setenv boot-file kernel/sparcv9/unix........"
NOTE: I have not ever tried this so I would test it on a machine you have locally first!!!
BTW: I don't think patching in multi user is stupid, I think if you do it (and I do) you need to quiesce the system and make sure you have a backout plan e.g. detached mirror.
I am guessing something went amiss in the patching and the kernel is stuffed i.e. half applied patch

IMac won't boot anymore after power cut

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