Hello, today I came home and I when I sit in front of the PC I heard a strange sound from it. It's not very noise but if it's quit then I hear it. I believe that maybe it has to do something with my PSU, because when I put my ear closer to the PSU I hear it very clearly from it. Also It sometimes just go away and sometimes appears again. So my quiestion is is it seriuos? Hardware: Motherboard: Intel Corporation DG33BU CPU: Intel Core 2 Duo E4400 @ 2.00GHz All of my devices temp's are normal. Thank you.