Mother 32 power issue

Hi All

I was gifted a used Mother 32 that won’t power on. I’m a part-time guitar/pedal tech and know my way around a PCB, but obviously, without a schematic its a bit hard to diagnose what’s going on. There is power flowing to the main board (tested at the input pins on the board) but the test points are all reading 0v, leading me to believe that some component is toast right at the start of the circuit/in the power handling. Any tips would be appreciated!