Can't see any wireless network on my g5 dp2.5 can anyone help?

hello - i have just bought a 2005 model dp2.5 g5, and an airport extreme card. I have a wireless network at home which my other macs are all seeing fine, but this new computer won't see any network at all. i tested the extreme card by putting it in my laptop and it works fine. have tried to log on manually but again the computer doesn't see any network. the airport logo is there on the top menu bar but with no signal.
any ideas?
Tony

Very similar topic. I have a g5, but I have a windows desktop, windows laptop, and xbox360. I have an airport extreme card with the antenna in place. The two windows machines have their wireless network cards and antenna.....the xbox has it's wireless adapter. When I start up the machines, the three microsoft machines connect just fine, the G5 won't connect. I can run an ethernet cable to the Linksys G router, and sometimes that kicks in the airport card. But who wants to do that every day.
I can share files between the two windows machines, but not to the powermac. not sure about the xbox360.....the wireless adapter is an xmas present. But connected via ethernet cable, the xbox won't work with anything.
Help please.
Harry.
I just bought a new router with the notebook which I got a couple of weeks ago. The old router was a B and the new one a G, but that is moot. Everything is backwards compatible....and none of the machines support X.

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    Message Edited by JakeT on 03-12-2009 02:54 PM

    Thanks but it's just my desktop that doesn't see it though.  My notebook sees it everytime, even at the same exact time that my desktop doesn't see it.  For example yesterday when I was typing up this post, I was typing up the post on my notebook because my desktop didn't see the router.  I don't think it has anything to do with the router actually, but I wanted to see if anyone on here has encountered this issue before.  Other forums have similar issues but I've tried all of the fixes I found elsewhere and they didn't work.
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