Imac 27" wont boot fully

WeLoveApple

New member
Booting only half way then it reboots. Sometimes with a horizontal line across the top.
Tried with good boot HDD and another PSU. Same
Any idea?
I read in another post that it may need a clean ME. Could that be the case?
 

aprendiz

Moderator
Apply some heat to GPU and test again, ive not seen an imac with ME region failure unless somebody has messed with bios chip..
 

dukefawks

Administrator
What is machine is this, this is 100% GPU failure. If you have the serial number I can tell which chip is in there.
 

aprendiz

Moderator
Could be 216-0810001 with 512 VRAM (HD 6770M) still available new or 216-0811000 with 1GB VRAM (HD 6970M) hard to find real new....
 
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