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Question: Booting into Mac OS stalls at about 75%

I own (among other models) a mid 2007 iMac. (Yes I know it is 11 years old. But it does what I want) 20 inch screen Core 2 Duo t7700, 4Gigs DDR2. Besides upgrading ram to 4 Gigs, I swapped out the standard platter HD with a 250 Gig SSD. It has worked flawlessly for years. For the last year it has been used to watch movies and TV shows off my Plex server.


2 days ago I uninstalled Teamviewer because it was acting up and kept crashing. After I uninstalled it I rebooted the Mac and when the progress bar got about 2/3 of the way during booting the screen went off and back on, the progress bar went from black to grey and what I would call a progress wheel started spinning under the progress bar, then the screen turns off and back on every 7-10 seconds and it keeps doing that.


I figured TeamViewer pooched something so I cleared the PRAM and SMC. That did nothing, I checked to make sure the memory was seated properly by ejecting and reinserting the ram. I reinstalled the OS with the recovery partition, I even took the system apart and made sure the HD was connected, I resat the Video card and the CPU as well as the wifi & Bluetooth adapter. But even with all of that it still gives me the same issue.


And idea what is happening and a way to resolve the issue.

iMac, OS X El Capitan (10.11.6)

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Answer:

A Troubleshooting Procedure that may Fix Problems With Lion to Yosemite


You should try each, one at a time, then test to see if the problem is fixed before going on to the next.


Be sure to backup your files before proceeding if possible.


  1. Shut down the computer. Disconnect any third-party peripherals.
  2. Reset your Mac's PRAM and NVRAM
  3. Intel-based Macs: Resetting the System Management Controller (SMC)
  4. Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally. This is slower than a standard startup.
  5. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. After Disk Utility loads select the hard drive entry (mfgr.'s ID and drive size) from the side list. In the Disk Utility 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. (S.M.A.R.T status is not reported for external drives.) If the drive is "Verified" then select the indented (usually, Macintosh HD) volume from the list. Click on the First Aid tab, then click on the Repair Disk button. When it finishes then click on the Repair Permissions button. When that has completed quit Disk Utility and return to the Utility Menu. Select Restart from the Apple menu.
  6. Run the Apple Hardware Test. Use Apple Hardware Test and How to invoke and interpret the Apple hardware tests - CNET.
  7. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button below Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  8. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  9. Erase and Install OS X Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Partition tab in Disk Utility's main window toolbar.
  4. Set the number of partitions to one (1) from the Partition Scheme dropdown menu.
  5. Set the Format type to Mac OS Extended (Journaled.)
  6. Click on the Apply button.
  7. Quit Disk Utility and return to the Utility Menu
  8. Select Restart from the Apple Menu.

If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

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Mar 17, 2018 3:30 PM in response to Bfldworker In response to Bfldworker

A Troubleshooting Procedure that may Fix Problems With Lion to Yosemite


You should try each, one at a time, then test to see if the problem is fixed before going on to the next.


Be sure to backup your files before proceeding if possible.


  1. Shut down the computer. Disconnect any third-party peripherals.
  2. Reset your Mac's PRAM and NVRAM
  3. Intel-based Macs: Resetting the System Management Controller (SMC)
  4. Start the computer in Safe Mode. Test in safe mode to see if the problem persists, then restart normally. This is slower than a standard startup.
  5. Repair the disk by booting from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. After Disk Utility loads select the hard drive entry (mfgr.'s ID and drive size) from the side list. In the Disk Utility 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. (S.M.A.R.T status is not reported for external drives.) If the drive is "Verified" then select the indented (usually, Macintosh HD) volume from the list. Click on the First Aid tab, then click on the Repair Disk button. When it finishes then click on the Repair Permissions button. When that has completed quit Disk Utility and return to the Utility Menu. Select Restart from the Apple menu.
  6. Run the Apple Hardware Test. Use Apple Hardware Test and How to invoke and interpret the Apple hardware tests - CNET.
  7. Create a New User Account Open Users & Groups preferences. Click on the lock icon and enter your Admin password when prompted. On the left under Current User click on the Add [+] button below Login Options. Setup a new Admin user account. Upon completion log out of your current account then log into the new account. If your problems cease, then consider switching to the new account and transferring your files to it - Transferring files from one User Account to another.
  8. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
  9. Erase and Install OS X Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
  1. Select Disk Utility from the Utility Menu and click on Continue button.
  2. When Disk Utility loads select the drive (out-dented entry) from the Device list.
  3. Click on the Partition tab in Disk Utility's main window toolbar.
  4. Set the number of partitions to one (1) from the Partition Scheme dropdown menu.
  5. Set the Format type to Mac OS Extended (Journaled.)
  6. Click on the Apply button.
  7. Quit Disk Utility and return to the Utility Menu
  8. Select Restart from the Apple Menu.

If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.

Mar 17, 2018 3:30 PM

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Mar 17, 2018 5:33 PM in response to Bfldworker In response to Bfldworker

Attempt restarting in Safe Mode per Use safe mode to isolate issues with your Mac - Apple Support if that does not work then restart in the Recovery Partition and run First Aide and see if any errors appear. I suspect if a Safe Mode restart does not work another component has failed, considering the age of the computer you have to decide what you want to do.

Mar 17, 2018 5:33 PM

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Mar 17, 2018 7:05 PM in response to Kappy In response to Kappy

It's running El Capitan. It will not go into Apple Diagnostic Mode by pressing D. Perhaps it is because it is a Mid 2007 iMac, or El Capitan has a different key to initiate diagnostic mode. I ran First aid, it came back fine. S.M.A.R.T. is reporting everything is ok and it does say Verified. I did delete all the partitions and I am right now reinstalling El Capitan. So I am hoping (perhaps in vain) it boots properly so I can get this back to video playback duty.

Mar 17, 2018 7:05 PM

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Mar 17, 2018 7:41 PM in response to Kappy In response to Kappy

My father was the original owner. I got it when he passed July 27th 2016. I got several PC's and this iMac. The only things that came with it was the iMac, Keyboard, Mouse and the power cord. No paperwork, discs or boxes.


Can I get these discs or download a image somewhere?

Mar 17, 2018 7:41 PM

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Question: Booting into Mac OS stalls at about 75%