hello
i have this strange problem with map a1502 820-3476-a when i put a bios from a donor machine the display comes white and take time to boot come to the end of progress bar and stops loading.Then i used another clean me bios it does not power on. Also tried other bios i get the black screen retina display but the chime keep repeating.
I understand this is bios problem how do i put a clean me region also my original bios the machine never turns on.
Please help me as i am confused what to do.
thanks

Just read the one treads upper your theme . All answers and hints waits from november 2014 viewtopic.php?f=350&t=108078

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