IMac not using Gigabit w/ Cat6 cable

I have my iMac (2010 i5) connected to a gigabit switch via a Cat6 cable. When left to connect automatically, the iMac chooses 100baseTX. If I manually force 1000baseT, the iMac will not connect. The strange thing is that I've used this setup before and I had a gigabit connection, with the only difference being that the switch was also connected to my Time Capsule. The other device has a gigabit connection without any toruble. Switching the cables does not solve the issue. The iMac continues to connect as 100baseT and the other device as gigabit.
One possible factor: the two devices are connected on a LAN using self-assigned IP (as opposed to being connected through the router using DHCP before).
Thoughts?

Nevermind. It WAS the cable. Looks like something went wrong elsewhere. 
This thread can be deleted.

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