Ah, ok. Open up the case. You've got one of these trapped inside.
But seriesly, the two most likely things are (a) a fan with a lot of dust buildup, or (b) a hard drive saying bye-bye. Hoping for the best!
503 posted on 04/05/2013 10:58:10 AM PDT by deoetdoctrinae
(The Old White Flag Republicans can go straight to He// and take their pal Obama with them!)