If your PC power supply is making a whining noise when plugged in, it could be a sign of a problem with the power supply. Here are some steps you can take to troubleshoot the issue:

Check the connections: Make sure that all the cables and connectors are properly seated and secured. If any cables are loose, tighten them up.

Clean the dust: Dust buildup on the power supply fan can cause it to make noise. If there is a lot of dust on the fan, clean it with compressed air or a soft brush.

Test the power supply: You can use a multimeter to test the voltage output of your power supply. If you are not comfortable doing this, you can take your PC to a technician to have it checked.

Replace the power supply: If the noise persists after you have tried the above steps, you may need to replace the power supply. This is especially true if the power supply is old or if it has been subjected to power surges.

It's important to take any unusual noise from your PC seriously, as it can be a sign of a serious issue. If you're not comfortable troubleshooting the issue yourself, you can take your PC to a technician for assistance.
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