Chony,
In case you have more as one power circuit in your studio, just unplug the dbx from the circuit where all the other devices are and take the power from another circuit.

Mots likely the problem is gone.
(IF the dbx is the problem)

(You could test ofcourse by getting power from your kitchen or another place )
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76