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I have this ticking sound over 1,5 years. It's in the above left corner. I think.
See Youtube to hear it!
After artifacs in windows with text and outside buildup, looping horizontal line i've got now only deadpixels with Youtube or Quicktime video's.
Many time I get a beach ball the iMac hangs.
What can this mean?
Bring it in twice to an Apple Service Provider. Answer: there is nothing wrong!
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Start up from your system installation disk and see if the sound persists.
这个答案有帮助吗？
I did that and it does. I even did a test when it was testing the thirth fase it ticked very loudly. No errors where found. Even when it's turn off it does make a ticking sound. But less loud. Could it be the PSU? I didn't know last night what my model number was. Because it was on.
It's EMC A1207.
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