Time Machine - no MAC address

I'm trying to use Time Machine on an iMac that lost it's ethernet a while back due to an electrical storm. I've been fine as I still have the airport and also the USB ethernet for the MB Air that works.
However I'm getting an error in the log when time machine starts that it can't find the MAC address, it appears it only wants the built in ethernet port? But it's not there! Is there anyway around it? What happens on the MB Air?
cheers.

My ethernet port has stopped working (spontaneously) and this has caused TimeMachine to fail, along with MobileMe services and Finder (not responding for about 10 minutes after startup).
Just looking at the TimeMachine issue though.
From the system log:
+Volume at path /Volumes/TimeMachine does not appear to be the correct backup volume for this computer. (Cookies do not match)+
If I do a clean install then I found that Time Machine still fails but the system log changes to
+Volume at path /Volumes/TimeMachine does not appear to be the correct backup volume for this computer.+
+Backup failed with error: 18+
However I could get TimeMachine working again by following the instructions in this link
http://www.insanelymac.com/lofiversion/index.php/t107717.html
I'll leave it up to you as to whether you think it's worth reinstalling your system in an attempt to get the backups working again. You could also try the fix in the above link without a reinstall but this did not work for me.
Good luck

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