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imac 2011 mid 27' infinite reboot cause

27' 2011 320watt imac kept infinite reboot b4. now is fine on an external monitor. Why?

  • A. power supply unit failure. becoz external mon has its watt source & dun rely on imac

  • B. graphic processing unit failure.

  • C. logic board failure. voltage regulator dying.

  • D. mixture of failures in PSU, GPU and LB. because this is very old machine.

  • E. your insight please.

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ninjasdu

ninjasdu

macrumors newbie
Original poster
Jun 3, 2022
2
0
hong kong
CE1E6AD6-EA78-434A-BDE1-EB28C6EFC3C1.jpeg
 

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