A technician replaced a failed PSU on a high-end workstation PC. Now, the PC fails to POST and does not stay turned on for more than five seconds. Which of the following power connections was most likely forgotten during installation?
The issue described suggests the 12V CPU power connector was likely forgotten during installation. The 12V power rail is essential for the operation of high-end workstation components, including the CPU. Without the 12V connection, the system will fail to POST and may power off shortly after being turned on.
Why 12V?
The 12V connector is critical for providing power to the CPU via the motherboard. Modern CPUs require a dedicated power source from the PSU, usually supplied through the 4-pin or 8-pin EPS12V connector.
If this connection is omitted, the motherboard will not receive adequate power for the CPU to function, resulting in the system failing to POST or shutting down after a brief period.
Incorrect Options:
A. 5V: The 5V rail powers USB devices, some motherboard components, and certain peripherals, but not the CPU directly.
C. 120V and D. 220V: These voltages refer to the power supply’s input from the wall outlet, not the internal connections to components.
CompTIA A+ Exam Objectives References:
220-1101 (Core 1), Section 3.5: Explains power supply requirements and troubleshooting scenarios related to component connections​.
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