My PB has suddenly lost all audio: no output through internal speakers; no recognition of accessories at earphone/speaker port; no digital audio signal. No chimes, warnings, CD sound, no sound from any application. Sound control panel under "Output" only will show "Internal Speakers" on the "Built-In Audio" port, also shows greyed-out volume slide bar and Mute box, with no ability to change, and a message "The selected device has no output controls." Using google search on "Powerbook G4 no audio" I found threads elsewhere on similar issues. I've zapped PRAM, reset open firmware, booted from OS X DVD, replaced system software with archive & install; left battery out for extended period; checked MIDI output rate; confirmed problem on all existing users plus new user. CONSOLE system log shows consistent "PSound assertion "0 !" blah blah "AppleOnboardAudio/PlatformInterfaceI2C_PlatformFunction.cpp" at line 393 and exits. No keypad control of volume (shows maxed out, but yet no sound) and I believe also no control of keyboard backlight. Apple level 2 tech says replace logic board, $800 just part, sorry that's it. Some outside posters report success replacing sound board, but is there a way to pin it there rather than logic board? There are many posts with similar problems that were software related (including a bunch of system 10.4 issues back a year ago or so) but no clear answers. I cannot find the Hardware Test disk for this computer, if I ever had one; even so, some have said this will report a logic board problem even when there isn't one, when multiple other sound issues are at the root of the problem. Does anyone have any suggestions? I cannot afford to repair the logic board right now, let alone replace the computer.
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