Hi out there! I have a 2008 mac pro 2 x 2.66 dual core xeon 10gb 667mhz ddrs ram ati radeon hd 5770 the other day i woke it up from sleep and the fans started blaring! i shut her down, started up again, and they were still cranking full pelt. i then turned it off over night and the next day, and for about a week, she was fine. Then after been asleep again when it came out of sleep they started up again. now they will not stop, as soon as i push the on button i hear them rev up and keep going. ive run istat and both processors are reading 126deg c and fans are running near on 2900. and this is the temp as soon as i turn it on and it doesnt change.. ive opened it up, pulled it completely apart and cleaned every last bit of dust out. Ive checked for programs and theres nothing using the processors. Ive reset smc. ive used onyx to clean and repair. so now what?? im at my ropes end without any idea!! so if anyone out there can help... please please please!!