G4 MDD 1.42 ghz dual, internal speaker does not work

I rebuilt a G4 MDD 1.42 ghz dual processor from a machine that did not boot. Had to replace the power supply and install the proper ram. The machine boots now and works fine. It does not make the chime on startup through the internal speaker. It does chime when externals are plugged in. I have checked all the settings in system preferences and everything looks okay. Checked the audio midi controls in utilities and all checked out. Reset the pram and still no internal speaker. Could the speaker itself be the culprit or am I missing something?

I suspect the trouble is with the jack, not the speaker.
Some Mac notebooks suffer a jammed muting contact within the jack that may be happening with your tower. Did you Open System Preferences > Sound, click the "Output" tab, and see if the internals show up? I know you say you checked the settings but, if the internal speaker is not clearly indicated on that tab, the mute contact is probably jammed.
People with notebooks suffering this are very often able to free it by inserting a plug and GENTLY wiggling it from side to side and up/down.

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