Which three steps do you perform to troubleshoot when a rack server powers on with no video? (Choose three.)

The front I/O dongle on Cisco UCS C-series rack servers connects the front panel video and USB ports to the system board; if it is unseated or damaged, the video signal cannot reach the display even though the server is otherwise powered on. Checking that it is properly seated (A) and that the front I/O cable is securely connected to the motherboard (B) addresses the most common and easiest-to-verify physical causes. A memory subsystem failure (C) prevents POST from completing and will result in no video output, making it a critical third diagnostic check.

Verifying the power source is not applicable here because the scenario explicitly states the server already powers on, confirming that power delivery is functional.

Reseating DIMMs, CPUs, and PCI cards is a broader and more invasive remediation step that goes beyond the targeted diagnostics identified by the three correct answers.