Depending on what model of NAD you have you can reset them back to factory settings. It should be in your manual, but if it is not the newer models use the delay and memory buttons on the front of the unit.
MY STUFF:
Denon AVR-1082
NAD T 773
Denon 910 DVD
Denon 1000 DVD
Klipsch KLF-10
Klipsch KSC-C1
Klipsch SS-3
Klipsch KSW-12
Monster power HTS 1000
Ethereal, Monster, KnuKoncepts Cableing