IMac suddenly can't detect airport express; all other devices can -help!

Literally overnight and with no changes in settings, etc. my iMac (running the latest version of Tiger) will not detect airport express. My laptop still detects it and connects just fine; my iphone connects via wifi, etc. It's just the iMac that isn't working.
Upon starting up my iMac this morning, I was prompted to "update airport firmware" which I did. Ever since then I can't get the computer to recognize airport.
I've worked on it for 2 hours disconnecting and resetting the modem; checking and unchecking boxes in the network settings, trying to renew the dhcp lease, etc. When I scan for wireless devices, the iMac does not detect one. If it does detect it, I get an "there was an error connecting" message.
So frustrating, especially since I have used this in the same way for over two years and have had NO problems until this morning.
The airport express has a solid green light. Any help is much appreciated!! Thank you.

Hi guys, its me again....
Dunno if is the same problem, but i dont think the problem is the airport, all of you (as i did too) tried making new users, deleting preferences, etc etc...
I tried resetting the airport, and is the same, is something in the computer that trigger the issue after the firmware in the airport, dunno how, but as far i saw, its the problem...
At least for me, after lost the connection, my airport on-off button stop working, if i turn off the airport in the upper menu or in the network preference panel, go off of course, but if i try to turn it on again, desnt work anymore, the button works of course, but never change to ON state...
that button issue isnt a hardware airport issue, is a OS issue...
:S
P.D.: i've trying to replicate some situations on the computer, programs, task etc, bcuz' by some reason there's something that trigger the desconnection... by example, right now i've more than 4 o 5 hours without the problem yet.... but.... i've using none or unusual programs to make the regular tasks...
And last night, i leave the computer connected to internet the whole night, no user interference and was online all the time...
something is the trigger..
Message was edited by: daniac
Message was edited by: daniac

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