Any buzzing or ticking noise at idle is not normal, the sound from a CORSAIR ONE (stock) at idle should be similar to a low hum from the fans. How loud it is dependent on your room's ambient noise level. To put it in perspective, we generally put our ear within 6 inches of the top fan sometimes to listen for any odd noises because the idle noise should be that quiet. Some of you may have more sensitive hearing so this can vary. You can either send it in for a replacement or you can open up the panels to investigate the noise. Just don't remove any components for warranty reasons.