Satellite R840-12C: cannot switch off the WiFi function manually

I have recently purchased a brand new Toshiba Satellite R840-12C Notebook.
The Wifi LED remains "on" and the function key does not work, in other words cannot switch off the WiFi function manually.
Although the WiFi function remains 'on" I cannot connect to a wireless modem.
When I go to device manager I find conflicts in "other devices" for
1. Network Controller
2. PCI Simple Communications Controller
3. Unknown Device
Tried updating drivers by connecting through ethernet cable to the modem but to no avail.
Can someone help?

Hi
Did you install the WLan driver?
The notebook seems to be equipped with the Atheros AR9285 Wlan card and in most cases the Fn + F8 button does not work because the Wlan driver is not installed or does not work properly.
Recommend firstly deleting the WLan card from the device manager and then to reboot the notebook. After the new reboot install the new downloaded Atheros Wlan driver for this wlan card.
Here you can find all the Wlan drivers published by Toshiba:
http://aps2.toshiba-tro.de/wlan/?page=downloads

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Satellite R840-12C: cannot switch off the WiFi function manually

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