IBM 15-inch Flat Panel Monitor Speaker Bezel User Manual page 14

8. Connect the audio cable, which is hardwired to the speaker bezel, to the
audio speaker connector on your computer.
9. Plug the ac/dc adapter cord into a power outlet.
10. You can now turn your monitor on.
11. Press the power button on the speaker bezel to turn on the speakers.
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IBM 15-inch Flat Panel Monitor Speaker Bezel: User's Guide