A technician assembles a new desktop workstation. When the power button is pressed, the motherboard power LEDs illuminate and the cooling fans spin continuously, but the system fails to display video, produces no diagnostic beep codes, and does not complete the Power-On Self-Test (POST). The power supply unit has been verified to be functional and correctly connected to the main 24-pin ATX motherboard power socket. Which of the following is the most likely cause of this issue?
- The auxiliary 8-pin EPS12V power connector for the CPU is disconnected.Cevap
- BThe memory modules are populated in adjacent slots rather than alternating dual-channel configuration slots.
- CThe operating system boot loader files on the primary solid-state drive are corrupted.
- DThe graphics card driver installed in the operating system is corrupt or incompatible.
Cevap
The auxiliary 8-pin EPS12V power connector for the CPU is disconnected.
The 8-pin EPS12V auxiliary connector supplies dedicated power directly to the CPU voltage regulator circuit. When the 24-pin main ATX connector is attached, chassis fans and status LEDs will turn on, but without EPS12V power, the CPU remains completely unpowered. Because the processor cannot execute motherboard firmware, POST cannot start, leading to a silent system with no video output or diagnostic beep codes.
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CPU Auxiliary Power Requirements and Early POST Diagnostics