Airport will not connect to wifi - time out

Hi, I have an iMac that will not connect to my network. I get the greyed out network signal in the menu bar. When I try to connect to my network (it has a black network signal icon) it asks for the password and then times out trying to connect.
The modem is working because I can connect with my MBP.
I have re-booted, repaired permissions, booted, deleted com.apple.airport.airportutility.plist, re-booted.
No luck.
The internet connection cutting out has been happening for a while - it usually comes back after a restart.
Anyone know of anything else I can try?

robcub wrote:
deleted com.apple.airport.airportutility.plist
That file has nothing to do with connecting to a Wi-Fi network, but only with AirPort Utility.
Anyone know of anything else I can try?
You might try resetting your connection settings using the steps listed in this message:
http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
They're not guaranteed to solve the problem, but they'll only take a minute or so to try.

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