Our internet connection keeps reverting to Airport from Ethernet.

It is an iMac 2.16 GHz Intel Core. The other iMac which was purchased a year ago is fine. The 2 computers use a Netgear router supplied by Time Warner. The wireless connection also seems OK. The older Mac reverts to Airport instead of maintinaing its ehternet connection. This just started happeneing.
Any ideas?

Turn Airport off on the computer. Or in the computer's Network preferences use the toolgear dropdown menu, select the option to set service order. Put Ethernet on the top of the order.

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