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I have an 2011 iMAC 27 desktop, recently a totally black screen shows up after turning it on, I can hear the chime sound, but the screen is totally black. Can anyone advise what could be the issue? And how to isolate it?
Thanks,
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Most likely is a GPU failure. As Dan said an external monitor may help confirm this.
This is a well know issue on this model and Apple had a repair program on it for a while but it has expired.
This was mainly on the model with the serial numbers ending in The last four digits of affected models must include DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610, DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8
Your serial number is on the bottom of the stand.
https://9to5mac.com/2013/08/16/apple-ope...
Prices have remained high for the replacement GPUs as demand is high.
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Thanks for the feedback, I appreciate your comments.
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Using a bright flashlight rest it on the display on the running system as a sharp angle are you able to see the faint image of your desktop icons? An alternative way would be to connect an external display via the miniDP connection to the Thunderbolt port in the back.
One other test would be to connect a second mac system via a network connection are you able to access it remotely? This would isolate out the issue as being a display only problem.
Dan さんによる
Thanks for the quick response, Dan. I gave it a try, 4 times, and found the screen can light up the first two times, but completely dark at the rest. If I connect it to an external monitor through display port, should I remove the screen display or can have it attached? Any thoughts?
Tom さんによる
What do you mean by 'light up' are you trying to say the backlight is working, just not seeing an image? If thats so, the issue is within the GPU logic, not the backlight. You'll need a new GPU board to fix your system as @mayer pointed out.
Your system is designed to support two displays, no need to disable the internal.
Dan さんによる
I mean the display is working in the first 2 times, I can see images, but completely dark when I try the 3rd and 4th times (full shutdown and turn it on).
Tom さんによる
@lovecd - This is looking like a GPU issue. Sorry ;-{
Dan さんによる