16) Pry back the motherboard clips

Asus Eee PC 900HD motherboard (top)

Pry back the two metal clips that hold the motherboard in place.

17) Unplug the fan connector

Asus Eee PC 900HD fan connector

18) Unplug the speakers connector

Asus Eee PC 900HD speakers connector

19) Cover screen, then lift up motherboard

Asus Eee PC 900HD motherboard (bottom)

Put a paper towel or cloth over the display to prevent scratches.  Then, lift up the motherboard.  You can see the wireless network card to the right.  If you are replacing the WiFi card, remember to remove the antenna cable.

20) Remove the screws to the fan

Asus Eee PC 900HD fan

These screws are different from the others, so set them aside as fan screws.