IP address is not renewing

Problem
When l try to use my internet in the system it's not working then I disable LAN card enabled after that system is not acquiring network address.

• Disable and enable LAN card
• Shutdown and Restart system
• Removed LAN and  reconnect
• Tied to static IP address
• Tired to diagnose or repair
• Change my switch 

 I tried these all things but the system is not acquiring IP address but some other system working and taking it from that switch. I removed system from that place connect some other place it acquired by the address then bring system old place its worked very well. It happening often?.

Solve

          Your system having some earthing problem so that LAN card become frozen

• Remove power from your system reconnect again
• Check your proper electricity  earthing
• Try to use three pin power cables