3 switches | Cisco, Allied Telesis, and ZyXEL

1 ALLIED TELESIS AT-GS950/24 24-PORT GIGABIT SWITCH + 2 SFP — sold 1 ZyXEL GS1900-8HP POE 8-PORT SWITCH — shipped as non-operational; only POE functionality works. The device’s system LED blinks continuously. Firmware was updated while the switch function was still operational—a rare occurrence. It remained functional for one week before reverting to the same LED error. I suspect a hardware issue. 1 ALLIED TELESIS AT-FS750/24POE 24-PORT GIGABIT SWITCH + 2 UPLINK AND SFP — shipped as non-operational; the specific fault is unknown. It intermittently functions: sometimes it works, other times it does not (as shown in the second-to-last image). It reports connected devices even when none are attached. 1 CISCO CATALYST 3560 SERIES POE-24 — operates as a standard switch but reports a POE/inline-power error; however, POE works on 3 ports