Maybe not the PSU, but possibly the *PMU*. Have you reset that?
The other issue makes me wonder about a controller problem, but I would definitely reset the PMU and PRAM before I did anything else (and make sure the PRAM battery is good, natch).
The other issue makes me wonder about a controller problem, but I would definitely reset the PMU and PRAM before I did anything else (and make sure the PRAM battery is good, natch).