FAILURE :No response received from workstation. Probably the workstation might be switched off or does not exist

FAILURE :No response received from workstation. Probably the workstation might be switched off or does not exist

 
 
Service desk throws an error "FAILURE :No response received from workstation. Probably the workstation might be switched off or does not exist" . It is Windows 2003 server.
 
Any idea what would be the reason  ?

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