Dell Vostro 430 (Late 2009) - Manual (Page 38)

6. Remove the processor from the socket.
Leave the release lever extended in the release position so that the socket is ready for the processor to be replaced.
Replacing the Processor
1. Align the pin-1 corner of the processor and socket.
CAUTION: To avoid electrostatic discharge and damage to internal components, ground yourself by using a wrist grounding strap or by
periodically touching an unpainted metal surface on the computer chassis before you install the processor.