Hi @Lukitoz, thanks for the additional info. Please try the following:
- Make sure your Mac is also connected to power with your original Apple power supply.
- Switch the S2 to MIDI Mode:
a. Unplug the S2 from your Mac
b. Hold Shift + Sync on the left deck
c. While continuing to hold these buttons, plug the S2 into your Mac
d. Launch djay and test again.