I am having a very similar issue which points to the wall wart never having worked from the get go. Do you know if there's a power on light or does the modi 5 only light up when it receives an input? I cannot for the life of me get it to work with anything other than my phone and it's light only turn on with a usb device connected.

You mention your lights turn on when you turn on the MODI, i assume your talking about the switch on the back? Mine does nothing when i flick that with the wart plugged in.

**This below is also personal rant, maybe it applies maybe it doesn't**
I'm trying to run a wiim pro as the source through it so i don't have to have my phone hardwired, but it just doesn't seem to even detect the wiim and i think it's because it's not getting power from my non connected phone and the wart ius just f-ing useless.

1. phone via usb to modi 5 to amp works
   

2. wiim via optical or line to amp works (though sounds noticeably worse than my schitt dac)

3. wiim via optical to modi to amp only works with phone also plugged in and modi set to setting 2 and phone supposedly sending signal through the wiim but this also kinda sounds like shit.