Wireless switch not working

I have a Precision M4700 with a Dell Wireless 1540 802.11a/g/n wireless card.  The motherboard and graphics card were recently replaced, and since then, I have not been able to turn on the wireless card.  According to the device manager, the card is working properly and the drivers are all up to date.  Fn+F2 does not work either.  I have checked the BIOS, and it lists the wlan card as being disabled.  Is there any way that I can enable the wireless card without having to open up the computer?