Asus P5SD2-FM Hardware User Manual page 23

4. Remove the heatsink and fan
assembly from the motherboard.
5. Rotate each fastener clockwise
to reset the orientation.
The narrow end of the
groove should point outward
after resetting. (The photo
shows the groove shaded for
emphasis.)
ASUS P5SD2-FM
Narrow end of the groove
1-13