820-00165 Slow starting up or not starting at all


Clean board, sometimes it will start but once the OS starts up it is very slow, most of the time the loading OS bar gets stuck and never finishes the startup process.

First thing I did was clean ME BIOS, same problem still.
Problem occurs in a different case/topcase and screen.
Tried a different SMC, same problem, no signs of corrosion.


Staff member
The board turns on, but not always boots?
Please explain the symptom correctly.

Did you try to start in SMC bypass, or safe mode?
PRAM reset was did?
Tried another SSD and LIO board/flex?
Same thing happens booting USB macOS?