A1418 iMac 21.5 2017 4K turn off after start booting

Dozer

Member
hi,

got this iMac, holding down "Alt" by turning on I can select wich drive. This is not turning off the device

after selecting external known good disk I can see the apple and the loading line, after some milimeters from the loading line it turns off completly and start again.

RAM I replaced already both. With only one RAM also tryed.

Is this a BIOS thing?
 
Last edited:

2informaticos

Administrator
Staff member
I don't have any for this board.
Try to clean original ME with Inetl FIT and UEFITool.

First, do PRAM reset 2-3 times, just in case.
 
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