Problem connecting to network

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We have a small business network. Server and five clients, the clients connect to the internet through the server, which has zone alarm.
Everything worked fine for months.
I then took one of the computers (a notebook) on a 10 day trip. It connected
through hotel LANs fine while I was away.
When I returned and hooked it back to the network I got no connection.
All other clients work fine.
All cables checked and working. All ports working equally.
Virus software updated and run.
If I manually assign IPs and gateways and DNS it will work.
But then each time I restart the server, I lose the connection again and have to retype IPs in.

Any suggestions on how get an automatic default connection working again
WinXP, SP2

Thank you,

Mark
 
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