I am in Graduate school in a suite with several others. I have a MBP running lion and my internet is hard wired through a port on the wall via Ethernet cable. There are two ports on the wall. One for me and one for my roommate. He does not have a computer, so I am currently using both ports...one for my MBP via ethernet and the other port goes into a Netgear wireless router to run wireless to our iPhones. There are no Macs or PCs hard plugged into the router...just from the jack to give a signal. The wifi works fine for the most part, at least until I turn on my external monitor for my MBP to run dual displays. The second screen is hooked up via mini DVI to HDMI. When I turn on my monitor to watch tv, wifi works as expected. But when I switch input to HDMI to use with my MBP, I lose my wifi signal all together. Phones nor PC or Mac can find the signal. Switch back to TV or turn the monitor off, and wifi comes back. The HDTV does not contain wifi support to my knowledge so I am completely stumped as to why I am losing my wifi signal... Ideas?