Ethernet acting up.

About 2PM yesterday, my ethernet started acting very strange. It was working fine and then all of the sudden it switched off. Then on again. It switches from connected and active to not plugged in about every other second.
The connection is fine and works with multiple other machines as well as the other 3 connections I tried. But my iBook acts up.

Formatting and reinstalling is pretty drastic for a dead ethernet port. Did you try a different cable? Did you test to make sure it's not the port on the router? Not sure what you mean by trying it on several other installs with external drives. Tried what?

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