My iMac won't boot, get a black screen with alarm sound, then gray screen with start up sound, then repeats

this problem started last fall after upgrading to Mavericks. If I shut down my computer (or restart) I have problems getting it going again. This is getting progressively worse. I hadn't shut down in over a month, forgot about this issue and shut down (which I used to do daily), so now I can't get my computer to boot. When I hit the power button I hear it starting, then a loud alarm sounds, then a long pause then start up sound with a gray screen with a progress bar. Once the progress bar fills, the screen goes black again for a bit. This whole process will repeat until I get frustrated and force - shut down by holding the power button. I have tried reseting the pram, starting up in safe mode, starting up with the command - R, starting up with my original install disc... none of it works. I'm at a loss! I do have an external hard drive that I have been using for Time Machine, but it's not recent because the disc needs repairs and I hadn't gotten around to buying a new HD to back up to first. Has anyone else had this problem? I really can't afford a big repair/replacement bill.

A long, steady, load tone followed by a progress bar can indicate it is trying to install a Firmware Update. Any other Tones would be multiple beeps and show an error code.
http://support.apple.com/kb/HT5860
You can also see a progress bar similar to booting into Safe Mode. However, the firmware update bar is thinner vertically than the Safe Mode bar.
http://support.apple.com/kb/ht1455
Either way, I would say something is wrong and it would be better evaluated at an Apple Store as Kappy points out.

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My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

My iMac won't boot up fully. It stays stuck in the gray screen with the pinwheel spinning, then after about 5 minutes just shuts itself off.

Try SMC Reset (unplug it from the back of the computer for 10 seconds then plug it back. in)
Try PRAM Reset Cmd + OPtion + P + R on start up.
Try safe boot - hold down shift on start up.
Try booting to install dvd (C on start up) or recovery hd (CMD + R) and using disk utility to run a verify and repair. If you still can't boot after that reinstall the operating system. If you can't find the disc or it wont boot to the disc.
Try single mode which is cmd+S on start up. It will open with a terminal looking window in the terminal. type in /sbin/fsck -TL. If it returns *system has been modified* continue to type that command in until it comes back with macintosh hd seems to be ok. If after 5 tries it still gives you system has been modified. You may have to replace the hard drive.

27 ", late 2010, iMac won't boot after turning on. Spinning beach ball and white screen.

Probably a relatively simple fix, or series of steps, that will return it to normal.

BD,
It's been a while, but I have since upgraded RAM to 12Gb and gone to Mavericks 10.9.4. Everything has run well until recently. Time Machine will not function on a new Seagate, 1TB GoFlex external HD,even though it was properly formatted and HFS journaled. Seagate techs said it seems to be a failing drive, yet it works perfectly on my laptop, a 15" MacBook Pro with Mountain Lion. The drive completes less than 10% of the backup before it locks everything up on the iMac with the spinning beach ball and a gray screen. Left it that way for two days and no change. Removed the drive physically and the iMac works just fine. I am baffled and really a bit frustrated here and wonder if you, or anyone else, has an idea about correcting this? I am suspecting that there is something deeper in the system going on than I am seeing.
I have run a verification of Disc Permissions/Repairs and keep getting this coming up: "Permissions differ on “Applications/Safari.app/Contents/Resources/Safari.help/Contents/Resources/inde x.html”; should be lrwxr-xr-x ; they are -rwxr-xr-x ."
That keeps coming up every time and is not fixed. I don't know if that has anything to do with that.
Baffled...

IMac won't boot up...wavy yellow/green/pink pixels on screen

Hey there,
I have a 24" 3.06 GHz Early 2008 model iMac. I installed Lion on it and it worked great for a couple weeks. One afternoon I was working on it and everything seemed to be fine, but when I left it for a couple hours while I was away, I came back and it would respond to anything. So I shut it down by holding the power button and tried to reboot it. It booted up to where the apple logo shows with the spinning loading gear wheel underneath, then after about 40 seconds it freezes. Also, there are a bunch of wavy yellow, pink, or green pixels that run horizontally across my screen. I've tried booting to the DVD and doing the hardware test with no luck. Does anyone have any idea what this would be?
Thank you so much for your time.

All I can suggest is a trip to an Apple repair station.
27" i7 iMac 10.6 , Mac OS X (10.7), G4 450 MP 1.5 GB RAM w/(10.5.8/10.4.11/9.2.2)

My iMac won't boot. I only get a white screen. Won't open in safe mode or recovery mode. Any suggestions?

Hey, any help? My 24" iMac won't boot. I only get a white screen when turning on. It won't open in safe or recovery mode. Any suggestions?

If you can't boot from your installer DVD, then take it in for service.

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.

My imac won't boot up. I get a white screen with the apple logo and the spinning spiral--any ideas?

my imac won't boot up. I get a white screen with the apple logo and the spinning spiral--any ideas?
I have started having trouble since i had to upgrade OS the latest in July 12.

http://support.apple.com/kb/TS2570 Follow this article and when it gets to the part where you go into disk utility using your install disc, you'll actually boot up holding down Command and R

My iMac won't boot i get an apple logo

my iMac won't boot i get an apple logo

Hi Paul,
If your iMac won't boot past a grey Apple screen, you may find the following article helpful:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
Regards,
- Brenden

HT3964 my iMac won't boot up. I hear the chime and the Apple symbol appears but there is no whirling indicator that appears and after a while the computer screen goes black and the whole cycle starts again. There have been occasions when it has actually s

my iMac won't boot up. I hear the chime and the Apple symbol appears but there is no whirling indicator that appears and after a while the computer screen goes black and the whole cycle starts again. There have been occasions when it has actually started and I have the dashboard appear but then the screen freezes

Since you have Lion v10.7.4 installed, use Lion Recovery to repair the startup disk if necessary, or reinstall the Mac OS X.

IMac won't boot up. Stuck in "verbose mode" ??

I've had this problem on and off for a few weeks now. I either restart my iMac after installing some new software-or for other reason- and my computer won't boot up. Sometimes it will stay at the white screen with the grey apple for hours if I leave it there. I've tried all the tricks with key commands. I even reinstalled my software, which worked, but now its happening again. Today, I restarted my iMac, and the same thing is happening, except sometimes it will go into what I've heard called- "verbose mode." The screen is black and white command text appears in the upper left hand corner. Here are some examples of what appears...
No Airport driver found.
Exited abnormally. Bad system call.
Repawning too quickly! throttling
10 more failures without living at least 60 seconds will cause job removal.
Will restart in 10 seconds.
(this will continue until it has restarted and failed 10 times. After this is done, it will display one of the following...)
too many failures in succesion
OR
local:/root# (continuously flashes on the screen)
OR
localhost:/ I have no name!# AppleYukon- eno link active, 100-Mbit, full duplex, flow control disabled.
I really don't know what to do. I'm really frustrated with my iMac. I've had to replaced a dead hard drive within the 6 months of my purchase, and now it is acting crappy again.
Can anyone help?
Thanks.

I tried using the disk utility on the grey disks, but
they can't repair the error on my HD. I can't restore
the original software from the disks either... there
is an error when I try.
No, you can't restore while the current OS is in place, due to the fact that your 10.4.8 isn't compatible with the older version (10.4.4) that's on the install DVDs. Once a Mac OS is in place, it can only be upgraded, not downgraded. You'll have to choose either:
to "Archive & Install" which would set aside your current system unerased until the new installation is completed and your current settings are transferred over - at which point you can erase the archived OS.
to entirely erase and reformat the HDD, then install a fresh OS.
Use the install disc's version of Disk Utility to perform either. First, though, you probably need to do a PRAM reset - that often clears things up so that you won't get an error message.
To reset the PRAM:
1. Shut down the computer.
2. Locate the following four keys on the keyboard: Command (Apple logo), option, P, and R. You will need to hold these four keys down simultaneously in step 4.
3. Start up the computer.
4. Press and hold the Command-option-P-R keys. You must press this key combination after the startup chord sounds, but before the gray screen appears.
5. Hold all four keys down until the computer restarts and you hear the startup chord for the second time.
6. Release the keys.

My iMac won't boot past grey screen and it didn't come with a os x disk

My iMac won't boot past grey screen with apple. I've tried booting in safemode but that didn't help and my iMac didn't come with a os x disk.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use either of the techniques in Steps 1b and 1c to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 10. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 10
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 11
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 12
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...

I don't know how to start my iMac up. I don't even know what a boot disk is! Several days ago I tried to run Boot Camp but couldn't continue because I didn't have a Windows program to install si I'm not sure what happened. Can somebody please help me out? Thanks.
Dman- [email protected]

My iMac won't boot....Msg says "NO BOOTABLE DEVICE--INSERT BOOT DISK ...
Posted: Jan 17, 2011 11:44 AM
I'm getting this message again. When I restart using the option key everything is ok. When the computer goes to sleep it has the above message. Is there a setting I need to turn off so this doesn't happen all the time? Thanks.
Dennis

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 with USB card reader attached

My quite new 24" iMAC won't boot if I have a USB card reader attached:
I get to the white screen with the apple logo, but it gets stuck there and the little spinning gear below the apple logo never appears (I've waited several minutes). (In all my test cases, there is no card in the card reader.)
I've tried two different card readers with the same results ("iDOTconnect" brand and a brand new Apacer unit, both are USB2.0 multi-format card readers).
The 1st one I tried via a USB hub, the second one I tried via a new hub and also directly connected to the mac (both of those hubs work fine).
Anyone have any ideas?
Regards,
Strathglass
Message was edited by: strathglass

Hello strathglass
The same thing can also happen with other connected devices such as external HD's and iPods, the Startup Manager is lost and searching for a boot volume.
1. You may be able to fix it by going to: *System Preference / Startup Disk* and select the *Mac OS X 10.5.5 on Macintosh HD* then *Click the lock to prevent further changes.*
2. Leave those devices that cause boot issues disconnected until the iMac is up and running!
3. Only sleep the iMac, and be sure to disconnect those devices be for shutting down or updates that require a restart!
As a habit, I have always ejected and disconnected all mounted USB devices (flash driver, iPods, cameras, card reader, etc.) from my hub be for sleeping, restarting or shutting down...
Dennis

IMac won't boot after power outage

I got a power outage a couple of hours ago. And now my iMac won't boot. When I power it up, it gets pass the white screen with the apple logo. The screen than turns blue with a spinning cursor. The cursor spins for about 10-15 minutes and stops but the normal login screen never appear and it won't boot into the desktop either. I just got a blue screen.
I have boot into the install Disc1 and did the disk repair and premission repair but it didn't help.
Any idea?
Sidney

Oh man, what a disaster!
I tried to do an Archive and Install but the installation hanged at the end of disc 2 after running an iWeb script (according to the install log) with about one minute left. I have waited for two hours but it just hanged there with all the drives spin down.
To make the problem worse. There was no way to quit the install at that point because all the menu items were disabled. The only way out was to power off. But when I powered it back on, it booted right into install directly asking for the disc 2. If I put the disc in it will install again and hang at the same spot.
Disc 2 contains iLife. I know Apple wanted to make things simple but why can't they give me an option to skip it? After all, iLife was already installed.
I finally got it working by booting from disc 1 and did a clean install. It took me all night to re-download all the updates and reinstall many applications. Fortunately, I have my address book, calendar, and most of my works backed up to .Mac so it wasn't a total lost.
On the bright side. Now my iMac is working better than before. I used to have problem getting auto sleep to work but now it works perfectly. Safari also had problem accessing charts (but Camino was fine) in a few web sites like schwab.com. Now everything works.
Lenn and David. Thanks for all your helps.
Now I am looking for a better backup solution so that the recovery won't be this painful if disaster strikes again. Any suggestions?
Sidney

My iMac won't boot, get a black screen with alarm sound, then gray screen with start up sound, then repeats

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