Final answer:
The issue with Workstation A not signing into the network with no LED activity could be due to a disconnected or faulty network cable, a problem with the switch/router port, disabled NIC in BIOS settings, incorrect NIC drivers, or a faulty NIC hardware.
Step-by-step explanation:
If Workstation A cannot sign into the network and there's no light and no activity on the network interface card (NIC) activity LEDs, there could be several potential issues. Firstly, ensure that the network cable is properly connected to the NIC. If it is properly connected and there's still no light, there might be a problem with the cable itself or the port on the switch or router it's connected to. It's also possible that the NIC is disabled in the computer's BIOS/UEFI settings or that the NIC drivers are not installed correctly or are corrupted. Lastly, the NIC hardware could be faulty and may need to be replaced.
The problem with workstation A not being able to sign into the network could be due to several reasons:
Defective NIC: The lack of light and activity on the NIC's LED suggests that it may be faulty or not properly connected. In this case, the NIC might need to be replaced or reseated to fix the issue.
Network cable issue: Check if the network cable connecting workstation A to the network switch is securely plugged in on both ends. A loose or damaged cable could cause connectivity problems.
IP configuration: Verify that the IP settings of workstation A are correctly configured. Check if the IP address, subnet mask, default gateway, and DNS server settings are properly entered.
Checking these possible causes can help identify and resolve the problem with workstation A not being able to sign into the network.