I did search a few times and read quite a few 'problem posts' to see if this had been addressed, but sorry in advance if I missed it... Occasionally, my Mac Pro's (8-core early 2008) fans will go to full speed after a shut down. I did the procedure of unplugging everything and letting it sit for 15 mins, and that seemed to work for a day or 2...but last night the problem was back. The only solution is to hold down the power switch for 10 seconds. Anyone else seeing this? Any hints/solutions for a Mac noob? Thanks, Don P.S. I just reset PRAM -- we'll see if that has any effect.