My duo2 doesn't boot no more and doesn't recognize a USB-stick either.
The white led flashes when I push the power button above the front USB connector
Before that, a number of times the system stopped reacting, with sound continuing. Picture mostly blocked. No reaction on remote control or Ethernet port. I had to cut power.
Before sending it for repair, can I check the power supply? I measure 12V on 4 output pins as marked on the print, but I was thinking about the problems with a capacitor with the duo I red about.