After a cleaning person left the network room, one of the paths to the SAN from Server A is no longer working. The redundant path is working fine. The cables are all connected securely but the HBA fau

If the HBA was unseated, the server would likely not even detect the HBA, and a fault light on the HBA itself would be less likely if it was not receiving power or properly communicating with the server's bus.

The problem describes a SAN connection, which typically uses Fibre Channel, not standard Ethernet for the primary storage path, making this option irrelevant to the scenario.

An ISL (Inter-Switch Link) connects two Fibre Channel switches, but the problem describes a path from a server to the SAN, not a link between switches.

If the cable is securely connected but the HBA shows a fault and the switch port has no link light, it strongly suggests the physical cable itself is compromised. A damaged cable would prevent the optical or electrical signal from reliably reaching its destination, causing both ends to report a link failure.