Guys, please help, recently my Mac Pro will restart ( not just shut down ), The shop tried to clean all the dust inside out, espeically from the CPU, lots of dust, it works fine for couples of day until yesterday, I noticed that when I tried to watch video or you tube, or transfer file from hard drive to hard drive, it will restart automatically, but it is fine if I just do something like download movies ( it can run over 24 hours ) p.s. the shop said he checked with the power supply is fine ! question : will it be the video card ? both 2 fans in the front and 1 in the back is running !!!! many thanks for any info !!