单项选择题

A technician has just installed a new power supply into a desktop computer and now the computer will not turn on. Which of the following is the MOST likely cause?（）

A. The voltage selector switch on the power supply is set incorrectly.
B. The 3.3v power line is connected to the wrong input on the motherboard.
C. The new power supply voltage rating is too high.
D. The 12v power cord is installed incorrectly.

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