no sound...card?

Can you post the output of:-
lshw -C multimedia
usually that gives the make/model of the sound card in the system especially if the sound card is onboard.

 description: Computer
    product: iMac LCD 15"
    vendor: Copyright 1983-2001 Apple Computer, Inc. All Rights Reserved
    serial: MAYQT2172MA
  *-core
       description: Motherboard
       physical id: 0
       clock: 99MHz
       capabilities: powermac4_2 macrisc2 macrisc power_macintosh
     *-firmware
          product: OpenFirmware 3
          physical id: 0
          logical name: /proc/device-tree
          capabilities: bootinfo
     *-memory
          description: System memory
          physical id: 1
          size: 384MiB
        *-bank:0
             description: SDRAM
             product: PC100-222S
             physical id: 0
             version: 0000,00 00,00
             slot: DIMM0/J12
             size: 256MiB
        *-bank:1
             description: SDRAM
             product: PC100-222S
             physical id: 1
             version: 4141,0D 66,02
             serial: 71V16635HCT8-H
             slot: DIMM1/J13
             size: 128MiB
     *-cpu
          description: CPU
          product: 7450, altivec supported
          physical id: 2
          bus info: cpu@0
          version: 0.1 (pvr 8000 0201)
          size: 700MHz
          clock: 99MHz
          capabilities: altivec performance-monitor
        *-cache:0
             description: L1 Cache
             physical id: 0
             size: 32KiB
        *-cache:1
             description: L2 Cache (unified)
             physical id: 1
             size: 256KiB
             clock: 700MHz (1.4ns)
     *-pci:0
          description: Host bridge
          product: UniNorth/Pangea AGP
          vendor: Apple Computer Inc.
          physical id: 100
          bus info: pci@0000:00:0b.0
          version: 00
          width: 32 bits
          clock: 66MHz
          configuration: driver=agpgart-uninorth latency=16 module=uninorth_agp
        *-display UNCLAIMED
             description: VGA compatible controller
             product: NV11 [GeForce2 MX/MX 400]
             vendor: nVidia Corporation
             physical id: 10
             bus info: pci@0000:00:10.0
             version: b2
             width: 32 bits
             clock: 66MHz
             capabilities: vga_controller bus_master cap_list
             configuration: latency=248 maxlatency=1 mingnt=5
     *-pci:1
          description: Host bridge
          product: UniNorth/Pangea PCI
          vendor: Apple Computer Inc.
          physical id: 101
          bus info: pci@0001:10:0b.0
          version: 00
          width: 32 bits
          clock: 66MHz
          configuration: latency=16
        *-generic
             product: KeyLargo/Pangea Mac I/O
             vendor: Apple Computer Inc.
             physical id: 17
             bus info: pci@0001:10:17.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: bus_master
             configuration: driver=macio latency=16
           *-ide
                description: IDE Channel 0
                physical id: 0
                bus info: ide@0
                logical name: ide0
                clock: 33MHz
              *-disk
                   product: ST340810A
                   vendor: Seagate
                   physical id: 0
                   bus info: ide@0.0
                   logical name: /dev/hda
                   capacity: 38GiB (40GB)
              *-cdrom
                   product: SONY CD-RW CRX170E
                   physical id: 1
                   bus info: ide@0.1
                   logical name: /dev/hdb
                   capacity: 358MiB (375MB)
                   capabilities: packet
        *-usb:0
             description: USB Controller
             product: KeyLargo/Pangea USB
             vendor: Apple Computer Inc.
             physical id: 18
             bus info: pci@0001:10:18.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: ohci bus_master cap_list
             configuration: driver=ohci_hcd latency=16 maxlatency=86 mingnt=3 module=ohci_hcd
        *-usb:1
             description: USB Controller
             product: KeyLargo/Pangea USB
             vendor: Apple Computer Inc.
             physical id: 19
             bus info: pci@0001:10:19.0
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: ohci bus_master cap_list
             configuration: driver=ohci_hcd latency=16 maxlatency=86 mingnt=3 module=ohci_hcd
     *-pci:2
          description: Host bridge
          product: UniNorth/Pangea Internal PCI
          vendor: Apple Computer Inc.
          physical id: 102
          bus info: pci@0002:20:0b.0
          version: 00
          width: 32 bits
          clock: 66MHz
          configuration: latency=16
        *-firewire
             description: FireWire (IEEE 1394)
             product: UniNorth/Pangea FireWire
             vendor: Apple Computer Inc.
             physical id: e
             bus info: pci@0002:20:0e.0
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: ohci bus_master cap_list
             configuration: driver=ohci1394 latency=16 maxlatency=24 mingnt=12 module=ohci1394
        *-network
             description: Ethernet interface
             product: UniNorth/Pangea GMAC (Sun GEM)
             vendor: Apple Computer Inc.
             physical id: f
             bus info: pci@0002:20:0f.0
             logical name: eth0
             version: 00
             serial: 00:03:93:7e:b6:f4
             width: 32 bits
             clock: 66MHz
             capabilities: bus_master ethernet physical
             configuration: broadcast=yes driver=sungem driverversion=0.98 ip=76.111.119.98 latency=16 maxlatency=64 mingnt=64 module=sungem multicast=yes

I can't seem to locate any audio information. I installed Ubuntu Hardy Heron and Kubuntu yesterday. Before that it ran OS X 10.1.4 and had sound.

Thank you for your help.

From the output it does seem that there isn't any sound card in the system, do you remember the make/model of the sound card in the PC if possible?

I can't seem to find that information. It's the integrated soundcard that comes stock with an imac ppc g4.

Check your BIOS to see if the sound chip is actually enabled.

How do I check BIOS?

...and to enable sound chip if it is disabled?

Thanks

When you enable your computer and the ram counts up (part of the POST) you can press either DEL or F2 then you'll enter BIOS. In case you see only a logo seconds after enabling the computer you'd press repeatedly one of the aforementioned keys to reach BIOS.

In BIOS itself you'd have a look on the upper corner of our screen and figure out what kinda BIOS you have (probably Phoenix or AWARD) and consult google then for specific details. Try someting like "+BIOS +Phoenix +sound" in Google or goto [http://translate.google.com/translate?u=http%3A%2F%2Fwww.bios-info.de%2F4p92x846%2Ftitel.htm&hl=de&ie=UTF8&sl=de&tl=en]. Here you can find everything you need. ;-)

Unfortunately I do not have the powers to change the state of this question to SOLVED, EXPIRED or INVALID. Someone here at Launchpad either grant me that permission or simply apply the change in state to this question, please.