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Anyone having any tips why my iMac won't start? When I press power on the startup check is running and the CD ROM makes noise, when it continues the computer just shutting down and tries to boot one more time. This goes forever. The screen is black the whole process. Can it be hard drive failure? I've opened it up, but can't see any failure on mobo. Any tips appreciated :)
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The 2011 27” iMac has a well know issue with the GPU failing. For a while Apple even offered a repair program for it. For a short period it extended this program but was very quite about it:
https://www.techradar.com/news/apple-may...
To see if this is your issue, hook up an external monitor and see fir it works. If it does , then the GPU is not your issue. If it doesn’t then you need to replace the GPU.
I replace it with a better 2GB card as just replacing the original may result in the same issue.
NEW 661-5969 661-5968 Video Card AMD HD 6970M 2GB For iMac 27" Mid 2011 A1312
这个答案有帮助吗？
Thanks for the reply. I've uploaded a video to YouTube that maybe describes the problem better https://youtu.be/ieMaSefDHwc . Do you still think it can be the GPU? When pressing power on it starts for like 5 seconds then restart again :s
I'm getting no sound on your video.
The audio is a bit low, but it's there
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Let's give this a try: Restart your system and this time press and hold the T key to enter into Target Disk Mode.
Reference: Mac startup key combinations Do you see either a FireWire or Thunderbolt Icon on your screen?
由 Dan 完成的
Thank you for reply. The screen doesn't turn on at all so I can't use the keyboard or mouse. The CD ROM makes noise, then it shuts down again.
由 Stian Ask 完成的
Did you really give it a try as I outlined?
You may need a USB keyboard to get it to work.
由 Dan 完成的
I tried with the keyboard that comes with iMac. Connected via lightning cable to the USB port
由 Stian Ask 完成的
I've uploaded a video on YouTube. https://youtu.be/ieMaSefDHwc
The sound might be a bit low
由 Stian Ask 完成的
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