Wireless problem - imac and macbook pro conflict

Hi,
since upgrading both my macbook pro and my imac to snow leopard I have this wifi problem:
- when both computers are set to use airport, only the imac is able to transmit/receive.
in network diagnostics on the macbook pro: Airport, Airport Settings and Network Settings are OK (green). but ISP, Internet and Server fail(Red).
If I turn the imac's airport off, the macbook pro airport springs into life (all green)
The IP addresses shown in the network preferences are different.
so... I can use them separately but not together
I'm using a netgear DG834G router
xtra info :
There are 2 other computers that are often connected to the router, neither experiencing any network problems - and having no effect on the above problem in any combination.
these are:
1) macbook running tiger via wifi
2) pc running some kind of weird windows thingy via ethernet
any ideas?

There's an issue in Snow Leopard where dynamic addressing is concerned. Both my Macs running SL (an Ethernet connected desktop and a MacBook Pro connecting via Airport Express) have IP conflicts when a new device joins my network. The solution that works for me is to set up a new Location in the Network preferences, click the Advanced button, navigate to the TCP/IP tab and select Manually from the "Configure IPv4" pull down. Type in a manual address that's within your subnet (you can pick up most of the correct information from the Automatic Settings). Most routers give you 50 addresses to pick from. Just pick one that's less likely to be used than the first 5 addresses.

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Wireless problem - imac and macbook pro conflict

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