Power supply buzzing noise

[tubadude45]

Hi i have recently purchased a corsair rm750x power supply and a buzzing noise sometimes happens when my pc is on but if i press on the back of the psu the noise goes away.
Any ideas what it is?

 

[Lutfij]

Can you elaborate with perhaps a video of what you mean by press on the back of the PSU...? If it's buzzing, can you please reproduce the noise with a video recording. It could very well be coil whine or a bad fan inside the housing and either could dictate an RMA.