High Sierra Install hangs on blank grey screen (iMac 5k 2015 27”)


i’m trying install high sierra , after while during installation (black screen installation progress bar), it’ll restart , boot blank grey screen. @ point, after waiting 15 minutes, hard reset mac , whole thing starts on again.

i’ve done 3 times , each time ends reboot , blank grey screen nothing happens. must do?
 

try thread. might of help.
 


Forums Macs macOS macOS High Sierra (10.13)


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