I saw a few posts on the Xbox fan noise and saw one person [Mod Removed - Please don't post self-repair tips]. I did not feel comfortable like he did in taking the brick apart to vend the fan back, or void my warranty. So instead I flipped the brick over and the noise stopped. So yes the fan is loose and is making the noise. I'll probably put cabinet bumpers on the top do it can stay upside down until I get the warranty call done.