My printer HP photosmart c4700 No longer has WiFi ?

My printer HP photosmart c4700 no longer works via wifi. It is plug in by USB and my Mac doesn't acknowledge it.if I try to install the WiFi from the dvdrom. I can print from my Mac to computer buy not printer to Mac or WiFi. I have uninstalled and reinstalled. No difference.This happened after I upgraded to Mountain Lion. Any Help ?