If you're using a laptop, you may find that the hum/noise stops when the laptop’s power cable is disconnected, which would rule out the components in the laptop causing the issue and would suggest it's being caused by the power supply or electric wiring in your building instead. Make sure you are using a power supply that has been approved or made by the manufacturer of your computer. If the problem doesn't occur with another computer, it may be the case that the wiring in the computer's power supply is not suitable or the components in the computer are generating unwanted noise.
If you find the issue does not occur in a different building, poor electric wiring and/or other electronic devices in the same building could be the source of the problem. This will not solve the problem, but it can help narrow down the ground hum source. Always try a different location or computer to see if this makes a difference. It could be an issue with the computer or the building you're in. There are also useful links at the bottom of the article with more information.
Ground hum/noise happens for a number of reasons the list below shows the potential causes of ground hum with audio interfaces and how you can solve them. Glitches in audio that occur with mouse movement or hard-disk activity.
Both of these issues can often cause unwanted audible effects that include:
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