Imac startup issue

[soulartist]

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.

 

[oldscribe]

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.

 

[honestone]

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.

 

[soulartist]

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.

 

[soulartist]

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.

 

[Bjean42]

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.

 

[PaTech21]

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.

 

[soulartist]

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.