Not so neutral

Last modified on August 13th, 2012 at 9:48 am



You are using a multimeter to check the voltage from your power supply to your motherboard, and you notice that the 5 volt pin is showing 5 volts, but the 12 volt pin is showing 7 volts. What is the most likely cause of this issue?

A) The motherboard power connector is faulty

B) The power supply is faulty

C) The wall outlet power source is faulty

D) The BIOS is faulty

E) The San Andreas is faulty


The answer: B) The power supply is faulty

The power supply is responsible for taking AC power from the wall outlet and sending different DC voltages to the motherboard and PC components. If a certain rail of voltage is incorrect, then the most likely cause of the issue is related to the power supply.

Want to know more? Watch “Troubleshooting Power Supplies.”

Troubleshooting power supplies requires some specialized tools and some common troubleshooting techniques. In this video, you’ll learn about circuit testers, the value of a good multimeter, and how to use these tools to troubleshoot power outlets and power supplies.

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Category: CompTIA A+ Pop Quizzes

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