I had a similar situation, I was new to VCDS, and programmed out Terminal 15,
(terminal 15 when selected as installed, is activated when the start button is pressed on, did you perhaps change it to NOT installed in the adaptation ?
Terminal 15 is under the dash, and can be bypassed, thus enabling the switched auxiliary components, so you can go back in with VCDS and program it as INSTALLED.( I selected as NOT Installed, that is when everything went dark)
VCDS port is such auxiliary that needs to get 12V to activate.
If you have not played around with the adaptation as I did, then you may simply have a bad relay, fuse and/or wiring path.
I came to this conclusion after the dealer repaired the problem, and I have since learned a little more about the complexity of VW, and the meanings of Terminal 15= switched 12V,Terminal 30= always hot and 50=ground.
I posted on this forum asking for help in locating and identifying this relay, without success.
I hope this gives you something to go on.
cheers//sam
edit: I think I made a mistake on the ground terminal, it should be terminal 31.