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Hi Dan and imac Einstein
After pressing T button after startup, the thunderbolt icons drifts on screen.
My inquiry:
(1)is GPU the only problem?
(2)Replacing is the only solution?
(3)Is there any way to know how many hours the GPU has been in service after manufacture?
(4) why GPU cannot be fixed by parts replacement?
(5) during safe mode, why the mac looks normal without auto restart?
(6) can upgrading to more advanced ios such as Monterey, or downgrade to lower ios , solve this auto reboot issue?
(7) if i buy a new gpu, is it better to buy 1G instead of 2G to reduce attrition and extend service lifespan years?