This is your wireless
Code:
06:00.0 Network controller: Broadcom Corporation Dell Wireless 1390 WLAN Mini-PCI Card (rev 01)
It most likely will use the b43 driver module. Check to see if it is loaded with this command.
If you see it in the list, then there is another problem. You may need to have firmware loaded for the wireless to work. Type in this command and check for any messages about the wireless. Post any that you think are important. Mainly, I am looking for a firmware error message.
This will output a lot, but look through it all.