Doepfer

I was installing the Delptronics LDB1e and expander - module webpage says it needed +5v. I already had the adaptor installed for the Rebel Tech Stoichea. Plugged the Delptronics module in, and didn't hear sound. Moved it to another rack, installed the +5v module, it worked. Then I tried patching to another module in the previous rack i tried the Delptronics in and it didn't sound right. I look at the LEDs on the busboards and only 1 LED is lit, +12v. The -12v isn't lit. All my other racks show both LEDs, the rack with the +5 volt module shows all three. WTF did i do, and how do I get it back to normal?? I dread the worst. Urgh. Help.