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iMac Startup Red-green Apple Logo Problem

macOs Sierra update after, startup problem. help please.


Startup Problem Video:

https://drive.google.com/file/d/0B404zgUVwxyUWXZoZVNSRGlQd2c/view


Startup Problem Screen Shot

http://i.hizliresim.com/Y48RL2.png

iMac, iOS 10.0.2, problem

Posted on Sep 28, 2016 3:40 PM

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Sep 29, 2016 5:06 PM in response to ifmyelse

Howdy ifmyelse,

It looks like you are getting a graphical anomaly when you start the computer centered around the Apple logo. I would start by resetting your NVRAM, which you normally would reset for graphical issues:

How to Reset NVRAM on your Mac

Thank you for using Apple Support Communities.
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Sep 30, 2016 9:41 AM in response to ifmyelse

I appreciate the info and the additional info. Next reset your SMC:

Reset the System Management Controller (SMC) on your Mac

If the issue persists, then we will next have to look into reinstalling the operating system. First make a backup of your computer using Time Machine:

Use Time Machine to back up or restore your Mac

You can find a guide to reinstalling macOS here:

How to reinstall macOS

Let us know if the SMC reset fixes this, or if we can help further.
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iMac Startup Red-green Apple Logo Problem

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