Hi! I'm with a weird issue with a Mac Pro 1,1 (2,1 FW). The problem regards at noisy graphics card fan. I can't understand why this is happening. So: When using OS X Snow Leopard all system works okay and very silent overall. If running OS X Lion the graphics card just "go crazy" making a very annoying sound I think this is the gpu fan. If run back to 10.6 it will work okay. If run bootcamp run okay as well but with 10.7 it's very uncomfortable with that noisy sound. Someone have this issue as well? Have any explanation for this problem and a solution that not involve get back to 10.6? Note: the graphics card is an ATI X1900XT (512MB). Cheers!