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Hey, got an 820-00165 on the bench that posts to a flashing "?" folder, but will not recognize SSD. When I try to use External USB it will not show up. Two things I noticed were it draws about .700 to .9 A and the CPU gets super hot. Not sure where to start with this one.
No history, No corrosion that I could see. I cannot get to disk utility because it will not see USB either. I will try a couple other SSDs and post voltages soon.