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Verify that volume setting in Control Panel is 1 or above. Clear parameter RAM. Hold down <Command> <Option> <P> <R> during startup but before "Welcome to Macintosh" appears. Verify speaker is plugged into logic board. Replace speaker.
Replace logic board. Retain customer's DIMMs.
This problem only occurs on systems using a 180 MHz or faster processor card. Upgrade to system software version 7.5.4 to resolve this problem (the Apple recommended solution) or, alternatively, install the Power Mac Format Patch, which can be found on the original system disks that shipped with the computer. To install the patch:
K Service Source
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