MAC Address Change

[Midnite Mac [Admin]]

Team,

I recently had an issue about a month ago. I had a USB port go bad on  
me. After contacting Dell for support on my Dell PowerEdge Srvr.  When  
the on-site tech arrived the next day and replaced/swapped out my  
motherboard for a new one he quickly left for his next client. Once  
the tech left I had tested all USB's, they all reported good again.  
But then, I relealized that my MAC Address would've changed and left  
me with no network status cause of the box still seeing the old one.

How could I have prevented this from happening, without having to re- 
install Ubuntu 9.04 Srvr again?

Yes, I tried Google and it got me now where.

Thanks,
Michael