I have a dell inspiron 6400. I am completely new to linux and have just installed the main edition of mint 12 (32-bit) from a dvd. I ran into problems with my wireless but from the community.linuxmint.com i found 2 users (community.linuxmint.com/hardware/view/9867) with the same laptop who had fixed these problems simply by installing proprietary drivers. At this point i was connected to the internet via an ethernet cable, no trouble there. I downloaded/activate the driver recommended in the additional drivers window. That is Broadcom STA wireless driver. This didn't fix the problem. From a youtube video (http://www.youtube.com/watch?v=tBSnIScnq5c
) it was recommended that i go on to install the broadcom-sta-common and broadcommon-sta-source drivers which i did. finally as per the advice of suffolk_rich (1 of the 2 users mentioned above) i used sudo apt-get install firmware-b43-installer in the terminal. after this i rebooted my laptop and noticed that i could no longer connect to the internet via ethernet much less wifi. Beforehand I clicked on the 2 computers icon in the top right of the desktop and acessed the network settings. There i saw 3 tabs on the side 1wired connection 2wireless connection and 3network proxy. Now i open it and it shows me the wired connection in the main part of the interface but only the network proxy tab on the left. additionally Wired connections cant be turned on and cannot be configured. additionally opening "network connections" will show all tabs but not recognize ethernet or wireless connections.