Unable to achieve Gigabit speeds with onboard NIC (iMAC Intel based)

Hi,
I've recently noticed that my iMAC's built in 10/100/1000 NIC is only negotiating up to 100mb. I have a direct (cat5e straight through) connection from the iMAC to a 10/100/1000 port on an Airport Extreme Base station.
I've tried several different (known good) straight through ethernet cables and I either get NO link or at most 100mb. I'm starting to think that the NIC might be flaky of failing because during a few tests with different cables, I got link after a very long delay. Close to a minute or more after plugging in the cable.
Before I call Apple tech support, I figured I'd check the forum to see if this is a known issue or if anyone else has seen this.
- Some more specs of my system....
20" iMAC (Intel based)
3 gig DRAM
OS 10.5.2
Thanks...

I'm seeing (within the Network Utility) when I select the onboard ethernet adapter that the speed is 100mb.
I've been trusting this output mainly because if I leave the Network Utility screen open and unplug or re-plug the cable back in, the speed <value> disappears and then re-appears once the speed (I'm assuming) has been negotiated.
Additionally, I've just checked the Network Utility on my Powerbook G4 (here at work), and it shows the wired ethernet speed to be (1G) as opposed to (100mb). I can think of no logical reason why my iMAC's ethernet port would be negotiating to 100mb unless either the NIC is truly flaky or the AEBS needs to somehow be configured accordingly.
Thanks. Let me know if you have any other thoughts..

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