[ubuntu] Power Supply failed

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http://ubuntuforums.org – Hi I have a Ubuntu 12:04 Server installed on a machine, the power supply has just gone bang. I have got a new machine and move the Mirrored disks over to it all boots ok. However it does not see the network card as it is different, how do I get Ubuntu to detect the new hardware it is now in, especially the NIC ? Thanks (Hardware)