[jcs_2000]

Strange abrupt loss of sound output on my G5, Dual 2.7 Gz, PowerPC.
Verbose reboot reveals:
rtion "0 != err" failed in "AppleOnboardAudio/AppleTAS3004Audio.cpp" at line 890 goto handler
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "0 != err" failed in "AppleOnboardAudio/AppleTAS3004Audio.cpp" at line 952 goto AttemptToRetry
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: AppleTAS3004Audio.cpp" at line 952 goto AttemptToRetry
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "0 != result" failed in "AppleOnboardAudio/AppleTopazPlugin/AppleTopazPluginCS8420/AppleTopazPluginCS8420.cpp" at line 434 goto Exit
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "!mI2CInterface->writeI2CBus ( i2cDeviceAddress >> 1, subAddress, data, dataLength )" failed in "AppleOnboardAudio/PlatformInterfaceI2C_Mapped.cpp" at line 274 goto CloseAndExit
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "0 != result" failed in "AppleOnboardAudio/PlatformInterface.cpp" at line 1507 goto Exit
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "0 != result" failed in "AppleOnboardAudio/AppleTopazPlugin/AppleTopazPlugin.cpp" at line 127 goto Exit
Oct 8 22:51:51 JCS-Power-Mac-G5 kernel[0]: ^PSound assertion "!mI2CInterface->writeI2CBus ( i2cDeviceAddress >> 1, subAddress, data, dataLength )" failed in "AppleOnboardAudio/PlatformInterfaceI2C_Mapped.cpp" at line 274 goto CloseAndExit
......
repeats about 20 times.

Does this mean the sound card is somewhat hosed?

[reader50]

Sound is handled by the motherboard chipset, unless you've plugged in some extra sound hardware. If you have extra sound hardware, try unplugging the 3rd party sound hardware and rebooting.

If that doesn't work (or is inapplicable), try booting from an optical disk, see if sound is present. If so, the problem is a glitched driver or something. Do an archive install.

If sound is missing even when booted from CD/DVD, try a PRAM reset, or a CUDA reset. Sound still missing when booted from optical disk? Ok, now you have a possible hardware problem.

[Waragainstsleep]

Run the bundled hardware test.