Can not turn on WiFi

Have HP Pavilion dm - 4 1165dx - normally F12 turns on WiFi, but this isn't work - like its frozen - 3 month old machine and it was working 24 hours previously - ideas?

So thank you very much for trying to help me - here's what worked in the end - when I got home, hooked to the laptop by a thread, and then went to the site already advanced by a technician:

Weblink for HP Quick Launch Buttons:

FTP://ftp.HP.com/pub/SoftPaq/sp49001-49500/sp49104.exe

Installation instructions
1. download the file by clicking on the button 'Download' or 'Get software' and save the file to a folder on your hard drive (make a note of the folder where the downloaded file is saved).

and the problem has been solved-

Tags: HP Notebooks

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