A desktop computer completely fails to power on when the user presses the chassis power button. There is no fan movement, no motherboard LEDs illuminate, and no sound is emitted. The technician confirms that the wall outlet is functioning and the power cord is securely plugged in. Which of the following is the most appropriate initial diagnostic check for the technician to perform?
- Verify that the physical rocker switch on the power supply unit is turned to the ON position.Cevap
- BReseat the RAM modules into alternating memory slots on the motherboard.
- CClear the motherboard CMOS settings by removing and reinserting the coin-cell battery.
- DReinstall the operating system to repair a corrupted system bootloader.
Cevap
Verify that the physical rocker switch on the power supply unit is turned to the ON position.
When a computer demonstrates a total failure to power on (no LED activity, fan movement, or sounds) while connected to a confirmed active power source, checking the physical I/O switch on the back of the power supply unit is the most logical first step. Power supply units feature an external rocker switch that physically breaks the AC connection; if turned off, no electricity reaches the motherboard.
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Power Supply Unit (PSU) Physical Controls and Basic Power Diagnostics