We have a test area next door and their was an existing server that was
turned off identical to one already on the LAN. (don't know why)..!!

Basically this was turned on which has knocked the original server off and
now it won't boot up correctly without errors.

Is there anyway to restore the current server, now that the old exact one
has been removed? There is just a lot of stuff on the test LAN, that would
take ages to rebuild if we have to blow everything away again.

Many thanks in advance.