I'm sorry to hear that you're having these issues. The fan may be producing a normal noise if it's pushed against a wall. I'd recommend checking to make sure that you have the latest firmware update installed.
If you'd like to have the unit serviced, you could call 800-SAMSUNG or fill out an online request form here:
anyone else feel that the fan is very loud?When we play a film or CD where the parts are quiet, you can really hear the fan blowing away.The unit also turns itself off now and again although it doesnt feel hot,I think there may be a problem with it.