How to be Sure my iMac sees my Preferred Wireless Network Each Bootup

I am still setting up my new iMac and deciding what to keep and what not to keep from my previous primary computer (G4 iMac running Tiger). The old G4 is still hardwired to my D-Link wireless router (DIR 615) and my new 21.5 inch is connecting wirelessly. The connection is basically really good and the iMac picked it up right away upon initial setup. I will eventually move the new iMac into the old G4's place and wire it up.
Here's my occasional difficulty. Sometimes, when my old G4 is off and I boot my new iMac I get a message saying something like my preferred network cannot be found. Usually I am given an opportuity to then log into said preferred network and it works fine. I, as best I can tell, have it designated the preferred (and so far the only) network in Network preferences. It seems like when my old G4 is already booted up that this is not a problem and my new iMac immediately connects.
As an aside, a household iPod touch and an Xbox 360 have no problem connecting with my D-Link regardless of whether the G4 is booted or not. The status of the G4 may just be a red herring and I may have just overlooked something in the network setup on my new iMac, although there really was no setup to speak of, it just worked from the start.
Thanks for any ideas.
Regards,
Steve M.

It says my 3.01 is current and no updates are available. It does actually give me this message.
Since my router is basically working OK now, I guess I won't pursue updating the firmware anymore than doing this check. Thanks.
Regards,
Steve M.

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How to be Sure my iMac sees my Preferred Wireless Network Each Bootup

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