HP DX2200 - Manual (Page 8)

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Hardware Upgrades
5. To remove the front bezel, pull outward on all three tabs on the
left side of the bezel 1 then rotate the bezel off the chassis 2,
beginning with the left side then the right side.
Removing the Front Bezel
✎
To replace the front bezel, insert the three hooks on the right side of
the bezel into the rectangular holes on the chassis then rotate the bezel
into place so that the catches on the three tabs on the left side of the
bezel snap into place on the chassis.