HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PC

Top cover
Description Spare part number
Top cover
For use with 33.8-cm (13.3-in) displays 599569-001
For use with 35.6-cm (14.0-in) displays 599570-001
Before removing the top cover, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet
and then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 57).
5. Remove the following components:
a. Switch cover (see
Switch cover on page 59)
b. Keyboard (see
Keyboard on page 61)
c. Speakers (see
Speakers on page 68)
d. Optical drive (see
Optical drive on page 65)
e. Palm rest (see
Palm rest on page 72)
Remove the top cover:
1. Position the computer right-side up with the front toward you.
Component replacement procedures 99