HP Compaq Elite 8300 Touch All-in-One Business Maintenance & Service Manual page 113

7. Remove the Torx screw (1) that secures the Mylar that covers the power button board, and then lift
the Mylar from the computer (2).
NOTE:
On some models, the left screw that secures the left speaker (when viewed from the rear)
may also secure the Mylar.
Figure 7-71
Removing the Mylar shield
Power button board
103