Could you please post the exact problem you are having.
For example my wi-fi is turned on in the laptop, and i can see my wireless router, when I connect to it, it says cannot connect.
It helps as we can norrow down the problem to say the settings of the router.
On some Dell models there is a (physical)switch to turn the wireless on and off - look on the side of the laptop or check the manual - it may just be turned off.
yes,i know ( F2 Switch has a wireless figure on it ),even if i press on it ,there is no change happens in wireless . but it turn the bluetooth on and off only . could only one switch open the bluetooth and wireless at same time ??