I've read the other posts for this problem, but don't know if all the same applies to my model.
I had a problem opening windows, which initiated a windows repair operation. Following that repair, I couldn't operate my wireless connection, or turn it on with the Fn 8 button. The Fn button doesn't even show up when I turn on the Fn panel, & I don't remember where I saw it, but my wireless is disabled. I tried doing a system restore to a later date, with no luck. I think this is related to a windows automatic update.
I don't think there's another way to turn on the wireless other than the Fn 8 button, is there?
I'm operating with windows 7 & a "realtek" WiFi card.
I'm disappointed No-one responded to this, but in case anybody cares; I downloaded a Toshiba update that was in cue & the Fn 8 key reappeared. I was then able to turn on the wireless antenna. I have since changed to Windows updates setting to "ask me".