WIFI random connection problems when connected to Cinema monitor

This is macbook pro purchased prior to 2008. I use an external cinema monitor in my office at home. Recently when I start the laptop with monitor connected I cannot get a airport connection. If I disconnect the monitor and restart downstairs I get an automatic airport connection.
I've changed channels on airport to CH 4 since we use cordless phones which I've read are on CH 11.
If I retart laptop downstairs and bring back upstairs and connect to cinema display, i can get airport connection.
Any thoughts on this? Seems to be a system configuration issue?

Odd that in your outline of troubleshooting steps you say you "disconnect the monitor and restart downstairs"...
Can you start the macbook pro UPSTAIRS where you want to be WITHOUT the cable attached to external display and get CONNECTION?
Sounds crazy, but mabey it's your signal strength? Sometimes a wireless connection will work at the edge of it's range okay but establishing connection at the same place will not work. Does that make sense?
Ensure that you can connect to the network when "upstairs" "near the cinema monitor" like you would if it were all working okay but DONT connect it.
Eliminate the up/down part first.
Can you elaborate on your network configuration? What Modem, Router, etc are you setup with?

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