Do you have a switch on the side of your laptop to switch on and off besides the wifi button sometimes you can accidently hit the switch on the side and no mater what you do it won't work
could be wrong but i know people who had that issue come to find out the switch on the laptop wasnt turned on
Never mind the switch i went to the HP site and here is the fix for your issue
http://h30434.www3.hp.com/t5/Desktop...dx/td-p/147638
you might have to go into your bios and reset everything to defualt and then it should work