Hi, I've struggling with this issue for a few weeks now. What happens is that my WiFi sometimes works and sometimes it doesn't. When it doesn't work it just says "WiFi: no hardware installed". The problem started appearing after I reinstalled Lion (then upgrading to Mountain Lion) after installing an SSD. I've got all the latest updates, tried resetting WiFi settings, resetting NVRAM/PRAM, ... I've googled all kinds of possible solutions but nothing seems to fix it permanently. I'm almost certainly convinced it's a software issue since it worked before the reinstall and randomly works now and again (almost every 2-3 shutdowns it starts working again). Any more suggestions? I own a Macbook Pro 15" (late 2011).