Hi, ive a mac pro 8 core 6 gigs of ram....today the machine will not get past the white, apple logo and spinning wheel....ive tried hardware test - ALL was good. I even tried the 'extended' testing again NO problem...Strange thing is ive tried to boot from cd and it keeps crashing. I cant even access the utilities mode. I have also tried a safe boot - this just made it hang...but this time without the logo - it was just blank grey screen....I have a lot of music production work stored and need to access it asap....any help or suggestions to this would help me so much, im at my wits end Please, please help! Merry Christmas to you all!!