G5 imac wont connect to gigabit switch at 1000

Hi,
I've got a G5 imac that wont connect to my gigabit switch at 1000. It looks like it connects at that speed for a few seconds then it drops to 100. I have a new Macbook pro that can easily connect at 1000 using that exact same cable.
Has anyone heard of any gigabit issues with G5 imacs?
Thanks,
Scott

I am now pretty sure it is the imac ethernet port. Connected the imac and mini together and eventually it set itself to 100Mbs.
Now trying to decide if it is worth getting fixed or just dealing with it only connecting at 100Mbs.
Thanks
Jason

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tdaignault wrote:
I tried to change the link speed and duplex from "auto negotation" to "1 Gbps Full Duplex," but then my computer no longer even could connect.
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