One last step you should take before declaring Pro 32 Dead, is to power down all of your digital front end gear (unplug it from the wall). In cases where folks used Audio Alchemy DDS Pro transport and connected via I2S bus cable, Pro 32 received +5V through the bus even when the transport was turned off from the front panel. It was sure to lock up the Pro 32...
Then power up Pro 32 first, then the transport, and the DAC last.
Let me know what you find. Since you are not using the I2S bus, my guess is that you will not have a good outcome but ...