Repair a network connection

1.See if the cable is pluged in or if is not broken someware.
2. ping your domain controller,your dns server and your gateway(if you have them if not skip this step). ex: cmd -->ping 192.168.1.1(dns ip adress)
3. Attempts to renew the connections DHCP lease:
ipconfig /renew command at the command prompt.
4. Flushes the Address Resolution Protocol (ARP) cache,
arp -d command at the command prompt.
5. Reloads the NetBIOS name cache:
nbstat -R command at the command prompt.
A NetBIOS name update is also needed, which is using the nbtstat –RR command.
6. Flushes the Domain Name System (DNS) cache:
ipconfig /flushdns command at the command prompt.
7. Registers the computer’s DNS name:
ipconfig /registerdns command at the command prompt.
8.If non of this works you shoud see if the network card drivers are ok or the network adapter is ok.