I received this product brand new this past week and when I first plugged it in and started to warm it up...it was vibrating and running extremely loud. About 30 minutes into play it finally calmed down and I haven't experienced the problem since. This is my first Sony Blu ray experience. I had LG DVD players in the past and they were always extremely quiet so this was a bit of let down for me. But I have to admit...the picture on my Sony Bravia XBR is amazing! If yours HUMMS a little in the beginning...then let her HUMM! It will simmer down!