Brand new iMac does not work wirelessly

This is a very strange situation and I don't know how much to be concerned about it.
6 weeks ago I bought the first of two brand new iMacs. We have two old G4s both wired into a Netgear wireless router, plus the printer. The first new iMac when switched on, immediately found the Netgear and has worked perfectly, wirelessly, ever since. As it should.
Less than a week ago I bought the second new iMac, which is identical to the first. I put it on the _same desk_ as the Netgear, therefore a distance of only one foot. Straight out of the box, it worked wirelessly to register itself with Apple.
Since then, it has only worked wirelessly very intermittently, and then very slowly indeed. I was wasting far too much time trying to figure out why the wireless did not work, and eventually wired it into the router too.
I was attempting to set up a network with 2 old G4s wired in, and 2 new iMacs wireless. Now I have 3 wired in and one wireless.
Is there something wrong with the second brand new iMac? Or is there some line I should be pursuing with Netgear?
I have written all the IP addresses down in case anyone responding - and I sure hope SOMEONE responds! - thinks that this may be a clue.
Many thanks in advance to all and any replies.

Update: I'm posting this in case it helps others......
I phoned the software support which comes free for 90 days with a brand new iMac.
The bright young man there instantly knew what the problem was, because he'd seen it all before. There's nothing wrong with the iMac and it has nothing to do with IP addresses.
I have to go into the Netgear configuration screen and Enable MAC filtering. This means I'll give the router the hardware addresses of the two iMacs and it will then allow both of them to communicate wirelessly - but no other devices which might be lurking in the vicinity.
Sounds good to me.

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