5. Turn the control panel over (callout 1), to gain access to the bottom side.
Figure 1-78 Turn the control panel over
6. Disconnect one HDMI cable (callout 1) and one connector (callout 2), and then remove the control panel.
Figure 1-79 Disconnect connectors and remove the control panel
Step 2: Unpack the replacement assembly
1. Dispose of the defective part.
NOTE: HP recommends responsible disposal of the defective part.
http://www8.hp.com/us/en/hp-information/environment/product-recycling.html
ENWW Removal and replacement procedures 71