dual boot: no ethernet in 10.6.8, Win7 ethernet Ok

Any suggestions.......?

imac 10.6.8, dual boot with windows 7

osx shows "no ethernet connected"
airport is Ok
in windows 7 Network/ethermet has no problems.

re-imaged the mac side back to an old 10.6.3 I had. however shows the same "no ethernet connected" ***?

any ideas