What causes the iMac black screen? Part 1 - How to fix the iMac black screen (full breakdown) - YouTube
The case of the iMac screen that mysteriously blacks out | Macworld
iMac 27" Black Screen? - Apple Community
SOLVED: black screen, no chime, no keyboard - Solved! - iMac Intel 20" EMC 2133 and 2210 - iFixit
Screen completely black, what could be wrong? - iMac Intel 27" EMC 2429 - iFixit
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GUIDE] Fix iMac flickering and dark scre… - Apple Community
Final Words - The 27-inch Apple iMac Review (2011)
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The Display - The 27-inch Apple iMac Review (2011)
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Fixing a Black Screen on Wake from Sleep on Mac | OSXDaily
SOLVED: Random Black screen, Help please - iMac Intel 20" EMC 2105 and 2118 - iFixit
iMac 27" Mid 2011 with weird backlight issue : r/macbookrepair