When a bearing in the power supply fan goes out, what should you replace? A. fan B. case C. bearing D. power supply E. None of the above

The correct answer is: A. fan

A bearing is a part of a fan that helps to keep the fan spinning smoothly. If a bearing goes out, the fan will not be able to spin properly and may overheat. In this case, you should replace the fan.

The other options are incorrect because:

• Option B, case, is the outer shell of the power supply. It does not affect the operation of the fan and does not need to be replaced if the bearing goes out.
• Option C, bearing, is the part of the fan that is actually broken. It is the part that needs to be replaced.
• Option D, power supply, is the device that provides power to the computer. It is not affected by the bearing going out and does not need to be replaced.
• Option E, none of the above, is incorrect because the fan is the part that needs to be replaced.