A technician encounters a PC where they can hear the power supply fan running, but the system is not booting up and there is no display. Which of the following are the MOST likely causes? (Select…

A bad PCI card may cause POST errors or specific subsystem failures but is unlikely to prevent all boot activity and display output entirely when the rest of the system has power.

A failed motherboard can receive enough standby power to spin the PSU fan but fail to complete POST or send any signal to the display, resulting in a completely unresponsive system with no video output.

While bad RAM can prevent POST and display output, it typically triggers audible beep codes from the system speaker, making the symptom profile less consistent with the described scenario than a PSU or motherboard failure.

The boot.ini file is an operating system loader file only relevant after hardware initialization completes; a missing or corrupt boot.ini cannot cause no-display symptoms that occur before POST.

A defective power supply may have its fan run on minimal standby voltage while failing to deliver stable, correct voltages on the main power rails, starving the CPU, RAM, and GPU of the power needed to initialize and produce a display.