I faced this unusual problem where the network cable is shown unplugged on one of the laptop even though patch cord has been plugged into the LAN port.
After connecting the patch cord though no lights were blinking on network card. I suspected hardware failure. Ran hardware diagnostics but all tests were passed related to network card.
After searching for a while on internet found it could be related to corrupt TCP/IP stack.
TCP/IP stack repair options for use with Windows XP -
For these commands, Start, Run, CMD to open a command prompt.
Reset WINSOCK entries to installation defaults: netsh winsock reset catalog
Reset TCP/IP stack to installation defaults. netsh int ip reset [log_file_name]
Note: the log_file_name needs to be specified, e.g. netsh int ip reset reset.log
Other things that can be tried
1) Create HKLM\SYSTEM\CCS\Services\Tcpip\Parameters, REG_DWORDDisableDHCPMediaSense, data 1.
2) Change connection type from 'auto' to '10 or 100MB full'.
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