External hdmi monitor connection causes airport wireless to fail

When I connect my 24" iMac (early 2009) to my Samsung 40" LCD TV using an HDMI display adapter and an HDMI cable, my built-in airport wireless connection stops working.
The airport will see wifi connections, but constantly prompts for the WPA password and refuses to connect. Occasionally it will connect, but only for a short time, and "ping times" to my router (small network packets) are large and sporadic.
This only happens when the adapter/cable are completely connected to the TV, and the TV is on. Of course this makes watching hulu.com on the TV very difficult!
Does anyone have any ideas?

Try resetting PRAM
http://support.apple.com/kb/HT1379
and if that does not help, resetting SMC (power management)
http://support.apple.com/kb/HT3964
which is unplugging the iMac and reconnecting using a precise procedure. You should disconnect ALL cables from the iMac when you do this. If you have been using a power strip to connect your power cord, try connecting directly to a wall outlet for this test. Power up with nothing connected except for the power cord, then connect only the keyboard/mouse. After confirming everything is working, including the AirPort connection, connect the external display. Does the problem recur or not?

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External hdmi monitor connection causes airport wireless to fail

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