did you use the recovery CD or the recovery partition?
try uninstall the WiFi drivers and try reseating the WiFi card in its socket. since you are reseating the card, take note of the brand and model of your WiFi card (base your driver from this). after this try to install the chipset driver and the WiFi driver.
d/load chipset driver here:
http://h20000.www2.hp.com/bizsupport...tem=ob-54136-1