I know others have posted connection problems but this is slightly differen

Question

I have a brand new iMac, shipped Sept 12, 2007 with the latest version of OS/X. I also have a G4 AGP PowerMac using the latest version of OS/X.
When I power up the iMac it always initially have an internet connection. I can reach a web site within the first 30 sec or so. But after getting into the web site connection is lost. NOTE: This is at startup regardless of "waking" from sleep or powering up fresh. It happens EVERY time.
The G4, running at the same time, has none of these problems. It wakes or cold starts and achieves internet connection and retains that connection right along while the iMac loses it.
Since both have the same version of OS I have to blame the hardware.

Answer 1

Andrew,
No resolution as yet. I was on and off my machine frequently over the weekend, putting it to sleep and waking it, etc. Not a scientific study but enough to determine that I am not figuring it out.
I have noticed that when I delay accessing the internet there is more of a chance of getting a connection first time. When I do some work in desktop program such as Photoshop for a few minutes then attempt connection I get in almost every time. I have also noticed that web sites that do not push a lot of content seem to connect more often first time as well. One fairly consistent thing: if I don't get a connection then wait for a while without going through the troubleshooting dialogs I often suddenly have a connection. Bizarre.
There seems to be more chance of getting connection the first time when I am on Ethernet v. wireless connection.
All that being said, without a discernable pattern I am no closer to figuring this thing out than before. The observations I have from a weekend of use don't give me a clear direction for troubleshooting this.
I can't blame the router; my wife's PC uses an Ethernet connection and has no connection problems at all. My G4 Power Mac connects no problem. It's just the iMac.