Imac startup issue


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Mac (Retina 5K, 27-inch, Late 2015) 10.11.6

Last week on startup, computer did hang on the progress bar. Had to restart.

Today, computer on startup showed near dark screen. Had to restart.

I believe this intermittent problem began with the 10.11.6 update.
 
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Hi,

I take it we are talking about an iMac, have you done an SMC reset?


SMC reset
  • Shut down the computer.
  • Unplug the computer's power cord from both the wall and computer.
  • Wait 15 seconds.
  • Attach the computers power cable.
  • Wait another 5 seconds and press the power button to turn on the computer.


PRAM reset
  • Shut down the computer.
  • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  • Turn on the computer.
  • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  • Release the keys.
 
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In addition to those excellent suggestions from oldscribe, it would be good if:

1. You make backups to an external device, on a "frequent" basis.

2. You perform disk cleanup/maintenance/repairs, again on a frequent basis.

3. DO NOT install either MacKeeper or CleanMyMac. They do more harm than good.
 
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Hi,

I take it we are talking about an iMac, have you done an SMC reset?


SMC reset
  • Shut down the computer.
  • Unplug the computer's power cord from both the wall and computer.
  • Wait 15 seconds.
  • Attach the computers power cable.
  • Wait another 5 seconds and press the power button to turn on the computer.


PRAM reset
  • Shut down the computer.
  • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  • Turn on the computer.
  • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  • Release the keys.
Yes, iMac. Will try your suggestion, although someone having similar issue tried same with no effect.
 
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In addition to those excellent suggestions from oldscribe, it would be good if:

1. You make backups to an external device, on a "frequent" basis.

2. You perform disk cleanup/maintenance/repairs, again on a frequent basis.

3. DO NOT install either MacKeeper or CleanMyMac. They do more harm than good.
Good advice which I adhere to.
 
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Any suggestions on how to PRAM reset if your keyboard is not synced to iMac?

Hi,

I take it we are talking about an iMac, have you done an SMC reset?


SMC reset
  • Shut down the computer.
  • Unplug the computer's power cord from both the wall and computer.
  • Wait 15 seconds.
  • Attach the computers power cable.
  • Wait another 5 seconds and press the power button to turn on the computer.


PRAM reset
  • Shut down the computer.
  • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  • Turn on the computer.
  • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  • Release the keys.
Hi,

I take it we are talking about an iMac, have you done an SMC reset?


SMC reset
  • Shut down the computer.
  • Unplug the computer's power cord from both the wall and computer.
  • Wait 15 seconds.
  • Attach the computers power cable.
  • Wait another 5 seconds and press the power button to turn on the computer.


PRAM reset
  • Shut down the computer.
  • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  • Turn on the computer.
  • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  • Release the keys.
 
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Mac (Retina 5K, 27-inch, Late 2015) 10.11.6

Last week on startup, computer did hang on the progress bar. Had to restart.

Today, computer on startup showed near dark screen. Had to restart.

I believe this intermittent problem began with the 10.11.6 update.
Are you still having these issues? I have the smaller iMac and just started having the same issues.
 
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Did the SMC reset, also scanned for adware with Malwarebytes Anti-Malware (none found). Since then, the issue has stopped. If you find more info, please post. Thanks.
 

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