iMac screen would turn black and start to flicker and I can not see or do anything on it.
If I use Thunderbolt to HDMI cable it shows everything on my hd TV, but the iMac screen itself is just black.
Also for example: If I'm playing music and it blacks out, the music continues to play, just can't see anything.
On an external display I can work on it, don't know if it's some kind of GPU issue or the screen itself.
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Since external monitors work ok it's not the GUP/VGC the problem is with the controller, cables or actual display. I would contact Apple Support about this... there's mild chatter on the internet so this may be "know issue" and have a silent or extended warranty fix offered.
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Can you tell me the end result what was the exact problem and how u fixed that?
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Are the last four figures of your serial number any one of the following:
DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8
DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610
由 mayer 完成的
These numbers are on a recall list and Apple will pay for the repair of their faulty GPU.
由 mayer 完成的