no sound after having changed psu

hey there, my buddy just changed the psu in his cab and now there is no sound. what could be causing this? everything looks to be wired right. any suggestions would be greatly appreciated. thanks j

What kind of cab (American, Japanese..etc)?

Type of power supply?

Was the cab originally producing stereo or mono?

Make sure the +12v is hooked up to the board properly.

Also, some boards won't produce sound without having -5v hooked up.

ANNNNND.... If there's an external amplifier for the audio make sure the +12v is hooked to it too.

RJ