I just bought a cheap Dell desktop in November to replace my 10-yr old XP machine-my needs at home are very modest. I loved the fact that it was so silent, since my old one could be loud. Lately, though, sometimes when I start it up, it's REALLY loud for a few minutes, during start-up, then goes quiet, and is noisy once in a while once it's on. The rest of the time, it's almost silent. Should I be concerned? It's way too early for it to have anything wrong ,and I can return it to Best Buy by January something, but would rather not go to the trouble if it's nothing to worry about.