User profile for user: JamesMooreFoto
JamesMooreFoto Author
User level: Level 1
4 points

iMac screen turning off and on again

Hi I wonder if anyone has had this...

When using my iMac just the screen randonly turns off and on again and shortly after its back on it will make the start up tone.

It is happening every 30mins or so.


Does anyone have any sugguestions as to what this could be or how to fix it please?

iMac 27" 5K, macOS 10.14

Posted on Jul 6, 2019 2:36 AM

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User profile for user: den.thed
den.thed
User level: Level 10
91,018 points

Posted on Jul 6, 2019 7:50 AM

Check to make sure that you're iMac's power cord is firmly connected on both ends, and then

  1. Reset the SMC, as per > How to reset the System Management Controller (SMC)
  2. Reset the NVRAM, as per > Reset NVRAM or PRAM on your Mac - Apple Support


Also if you have recently upgraded the RAM,

  1. check to make sure that all the modules are fully seated in the slots.
  2. remove the new modules and test it with only the original modules.
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User profile for user: den.thed
den.thed
User level: Level 10
91,018 points

Jul 6, 2019 7:50 AM in response to JamesMooreFoto

Check to make sure that you're iMac's power cord is firmly connected on both ends, and then

  1. Reset the SMC, as per > How to reset the System Management Controller (SMC)
  2. Reset the NVRAM, as per > Reset NVRAM or PRAM on your Mac - Apple Support


Also if you have recently upgraded the RAM,

  1. check to make sure that all the modules are fully seated in the slots.
  2. remove the new modules and test it with only the original modules.
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iMac screen turning off and on again

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