I am not yet sure the cause and may never know I suppose. I have had it since March and have used it almost everyday with very few issues. I am not sure that it matters, but I use it a lot for gaming (mostly Battlefield 2142) which seems to make it choke when I am on a busy server (30+ players). Anyway, about a week ago it started acting funny on shut down screen would lock and had to unplug to shut down. I figured it was just a fluke. Then it was fine for about 5 days and all of a sudden DEAD. I went to turn it on and nothing at all. No blue light no anything. I figured maybe the power brick was bad, but that was not the case. I took into the local Apple Store and their diagnosis was a bad logic board. So now I am waiting (very impatiently) for them to receive the part and then get it into my Mini. They estimated 7 days until I would have it back. And that is if the logic board is indeed the problem. Anyone else experience anything like this?