Call PS Audio, they are very helpfull.
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If you have not already done so, try unplugging it from the wall for a minute or two then reconnecting and restarting. If that fails, note what the display panel is showing and report the result to PS Audio. Mine worked well for three years before a similar problem as a result of an outage and had to be returned (at which point I was offered a great deal on a new P5 which I took, with happy results). Good luck and let us know the outcome.