HP d538 - Convertible Minitower Desktop PC Hardware Reference Manual page 16

Product Features
10. Remove the bezel subpanel as described in the
CAUTION: Hold the subpanel straight when you pull it away from the front bezel. Pulling
the subpanel away at an angle could damage the pins that align it within the front bezel.
11. Reposition the bezel blanks within the subpanel in the proper orientation for the
desktop configuration.
12. Reposition the subpanel (rotate it 180°) with the logo at the bottom, then snap it
back into the bezel.
Changing from a Desktop to a Minitower Configuration
13. Replace the front bezel and computer access panel.
14. Reconnect the external equipment.
15. If you normally lock the Smart Cover Lock, use Computer Setup to relock the
lock and enable the Smart Cover Sensor.
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"Removing Bezel Blanks"section.
Hardware Reference Guide