One computer fails to reconnect on startup

I have recently substituted a new computer on a site of 3
units. The other two computers were mapped ok and all
three talking together happily. However on shutdown the
new computer loses the mapping and this has to be re done
on each startup. This has never happend before on any of
the units. Where have I gone astray ?
TIA
Unichaz.

Please ignore my message I had forgotten to check the
connect at logon box.
Sorry to have troubled you.
>-----Original Message-----
>I have recently substituted a new computer on a site of 3
>units. The other two computers were mapped ok and all
>three talking together happily. However on shutdown the
>new computer loses the mapping and this has to be re done
>on each startup. This has never happend before on any of
>the units. Where have I gone astray ?
>TIA
>Unichaz.
>.
>