PSU makes a noise when scrolling up and down webpages

[Artmuzz]

I have noticed a problem with my MBA 11inch power supply when I scroll up and down webpages. When I scroll up and down using the trackpad I hear a slight buzzing noise from the power supply unit. Is this normal? Please advise.

I am using my MBA on my bed with the power supply unit next to it.

 

[wrinkster22]

my macbook air charger makes this noise also. It is normal.

 

[superego]

If you're using unearthed power adapter, I believe that is normal. Use earthed and the problem should go away. If it happens even on battery, it's not normal and you should take your laptop back. [Edit: I read first that the sound was coming from your laptop. I'm not familiar with the issue where the charger is making the noise.]

 

[Artmuzz]

If you're using unearthed power adapter, I believe that is normal. Use earthed and the problem should go away. If it happens even on battery, it's not normal and you should take your laptop back. [Edit: I read first that the sound was coming from your laptop. I'm not familiar with the issue where the charger is making the noise.]

The sound isn't coming from my MBA. it is coming from the PSU when I scroll up and down on the trackpad. I am glad its normal as I really wasn't wanting the hassle of taking it back for a repair.