I have a 820-00163 that chimes and starts up half-way, then kernel panics and restarts. Same for external and internal drives. Passes the Apple Hardware Test. I replaced the EFI chip (U6100) with no change.
I'm not the first work on this board; looks like the area near the SMC has had work done. Could this be an SMC issue?
I'm not the first work on this board; looks like the area near the SMC has had work done. Could this be an SMC issue?