Imac sees no wi-fi networks. Other computers do! Some input needed!! Thanx!

Hi people.
I just got a intel imac 20inch with an airport extreme card. A few weeks ago i tried looking for networks.
At home i found 8 wi-fi networks in my area with help of a windows laptop. My mac...detected nothing.
I went back to the shop (a shop with apple certified people) to let them check it.
Their conclusion was that my card was functioning correctly.
The receipt stated that they streamed a movie through airport and that there was no noticable delay.
Their airport base station was located a few floors above their technical dept.
I got my mac back and i went straight to home. Same problem. No networks whatsoever...
Then i went to my friends house. He's got a old dell with a sitecom wlan card.
He can find 4-5 networks in his area. My mac can only find his network. I use Istumbler + Spectrum Widget and the strenght is 50% on a distance of 1,5m (5feet) to his router!
How is this possible?
I know that to access another network you need some data. But to detect a network with it's SSID on you just have to turn airport on to see it. Right?
I reinstalled osx and i am doing a software update right now. To 10.4.7.
Maybe that helps but i doubt it.
Can anyone shed some light?
Should i go directly to apple and have them look?
Thanx!!!
Intel Imac dual 2,0 Ghz Mac OS X (10.4.4)

The software update is done. No improvement.
I saw another post with an answer from duane wich made me think that the antenna of my airport extreme card is not inserted properly.
Unfortunately the new imac's are not opened easy.
I hope that's it. After all.....they did not open my mac. Sigh.
I'm gonna call apple care.

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airport (snow) network with g3 ibook, intel imac and
g4 imac. g4 was tuned off for couple days and will
now not see home wireless network. airport symbol
appears gray and it shows up in system profile, so i
think it is functioning. in addition, the other
computers, as well as this problematic g4 imac have
always picked up 3 or 4 other neighborhood networks.
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networks when the other 2 computers do.
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this computer is not seeing any of the networks that
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