purple vertical stripes on iMac 27 inch mid 2011
computer doesnt start only white screen again restarts in a cycle
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Your system is not getting past POST as it has encountered an issue within the graphics services (GPU logic)
See if you can boot up in Target Disk Mode. Using a USB keyboard press the T key when you restart your system.
Reference: Mac startup key combinations
Do you see the FireWire or Thunderbolt Icon on the screen?
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