These boards have been removed from mostly new MONITORS with broken screens and should work if properly installed. HP 21KD MONITOR BUTTON BUTTON 715G7869-K01-000-004L. Please verify that your board part number is the same as 715G7869-K01-000-004L. The part number is the first number left of the /, or the sole number listed. Most often written in title as (part number / board number)