TCP/IP Configuraitons Checking

The first step in the troubleshooting process is to check the TCP/IP settings. You can check it by using the IPCONFIG/All command on the command prompt. You will see the configuration results. If you see a blank configuration for a card this means then the card is not assigned any IP address. You can assign the IP address manually or via DHCP server. If you are using the DHCP server for assigning the IP addresses then you can use the following commands to get and release the IP address.
IPConfig/Release
IPConfig/Renew
IPConfig/All
If the computer is still unalbe to obtain an IP address, then there are several things that can causing this problem such as bad network cable or NIC card, DHCP server might have assigned all the IP addresses from its pool, misconfigured TCP/IP settings, incorrect user name and password. You can try to add a new well configured machine to the replace the malfunctioning machine to see if the new machine is working with its settings. Also see if the driver of the NIC is properly installed or not. In case of driver's problem go to the vendor's website and install a new exact driver for the NIC.