I just had the same problem with my wife's HP Pavillion dv6000 laptop.
It was working fine, then just stopped recognizing the wireless card. My daughter had been using it, so I was in doubt as to what had/hadn't been done to it software-wise (virus?). So I ran the complete recover to restore everything to the state when it was new.
Still can't recognize the wireless. The indicator light stays orange no matter which position the switch is in.
So I google "HP dv6000" looking for a manual, and the FIRST thing I find is a Recall notice
http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=c01087277 Yeah, I know, they're covering their butts by calling it a
"Limited Warranty Service Enhancement" but they basically know that these machines were defective from the date of manufacure. They told me that my machine didn't qualify for the free service because it was 9 months past the warranty extension and tried to get me to shell out $250 for a new mother board.
Maybe I'll try the external wireless card solution, but it sounds like the MB will probably go bad next. I've owned a bunch of HP computers (have four of them working in the house right now) but I'll probably be looking at Dell next time around.