The Consumerist brings the story of an angry consumer who RMAed his PS3 console and got told that his warranty was void because of all the dust inside his console:
5 days later I have no updates on the PS3, I call in to check on it, The first rep I speak to says that it was received without a receipt, and was delayed but he was going to note that it was a gift and get the replacement sent out to me.
6 hours later I get a call from Neil saying that unfortunately they have opened the case and taken pictures of the inside and outside of the case and that it was too dirty to be eligible for replacement. I paused for a good 8 seconds, because my PS3 had not moved from the entertainment center that it sat in more than 8 months I had wiped it off before sending it out, THE WHOLE POINT of the PS3 Is that it is part of your entertainment center! I Told him that was crazy and that it was a known problem that the PS3 collected mass loads of dust. That their product hasn't even been out for 1 year and he's telling me I'm out of warranty because there is too much dust in it!? I told him that someone needed to double check because I really took care of my PS3 and there was no way it was so dirty that they wouldn't replace it. He said he would and he would find out about getting pictures.