PB540 no sound?

[AlpineRaven]

Morning all,

Can someone enlighten me to trouble-shoot this one;

PowerBook 540 does not have any sound output.

It was working 2 weeks ago when I last used it because I was playing games with it and now it doesnt.Swapped over to 520 screen - no sound

Swapped over known working ribbon cable (logicboard to display) - no sound

I dont *think* its the screen itself because I swapped over with another display.

IMO it might be the logicboard at fault?
I haven't checked the sound output port yet.

Any suggestions?
Cheers

AP

 

[Byrd]

The old spray out the 3.5" audio jack with contact cleaner and "exercise" it with a 3.5" jack might give life ... PRAM reset might also assist.