Fix Living Room LAN Socket

My living room LAN socket is not working, and I need help diagnosing and fixing the issue. The BT hub is located in a cupboard, and I'm unsure about the connection setup. Requirements: - Check and test the LAN socket... (Budget: £20 - £250 GBP, Jobs: Cisco, Computer Security, Linux, Network Administration, Network Engineering, Network Monitoring, Network Sales, Network Security)