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304-Keyboard or System Unit Error

Audible Beeps: None

Possible Cause: Keyboard, keyboard cable, mouse controller, or system board failure.


  1. Be sure the keyboard and mouse are connected.

    CAUTION: Only authorized technicians trained by HP should attempt to remove the system board. If you believe the system board requires replacement, contact HP Technical Support before proceeding.

  2. Run Insight Diagnostics and replace failed components as indicated.