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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > iMac 27 Inch Screen Randomly Going White

iMac 27 Inch Screen Randomly Going White
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Mac Elite
Join Date: Jul 2002
Location: My Powerbook, in Japan!
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Apr 13, 2017, 12:42 PM
 
Greetings!

I have a Mid-2011 27 Inch iMac. 3.2 i7. Latest version of Mac OS.

The screen randomly goes white and then either needs a restart, or restarts itself.

Does this mean our graphics card has gone to hell? Is it something else?

Joshua
     
Administrator
Join Date: Jun 2000
Location: California
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Apr 13, 2017, 12:59 PM
 
GPU or power supply. Try turning the screen brightness way down, and see if the white-out incidents decrease. If they do decrease, that would point to the power supply.

Do you hear a lot of fan noise, compared to when it was newer? If the fan and vents are plugged up, overheating could cause it too. Look for some air currents coming out of the exhaust vents. A temperature monitoring utility would help too.
     
Mac Elite
Join Date: Jul 2002
Location: My Powerbook, in Japan!
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Apr 13, 2017, 01:23 PM
 
I'll give those a try.

I kind of figured it was the GPU, as that make and model is known for having GPU issues. Apple even had an extended replacement plan because of it. We're just outside that window now.
     
   
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