My radio didn't actually die - Centrafuse didn't shut down correctly and ended up corrupting the config file for it. Just had to delete it and go through the setup again. As far as noises go, there's no interference from the PSU - I don't think there could be much, since the radio is powered by the harness directly. Whatever other noises are in the system, the TDA7850 denoiser circuitry takes care of it - that amp is awesome! I'm working on a new build and using the newer version of that amp again.