I have a big, silver, 40lb mac pro 10.4.8. Purchased in 2006. Here's some other stuff about it that I don't understand, Processor: Dual- Core Intel Xeon. Processor Speed: 3 GHz. / Number Of Processors: 2 / Total Numbers Of Cores: 4 / L2 Cache (per processor): 4MB / Bus Speed: 1.33 GHz / Memory: 2 GB / Boot ROM Version: MP11.005C.B04 / SMC Version: 1.7f8 / Capacity: 232.57 GB It suddenly stopped working yesterday. When I try to start it up it just makes a bunch of loud clicking noises and then a folder flashes in the middle of the screen with a ? on it. I read about a similar problem on here and it was advised that the person use their Install Disc 1 while pressing the D and run a diagnostic. I did this (3 passes) and the Hardware Test said there was No Trouble. Yeah, sure. Then unfortunately I couldnt get the computer to spit out the disc and when I turned it on again I forgot to hold down the D. So it got to some first section with menu options and I kept quitting out of everything I could! Finally it returned the disc! So NOW I dont know if my computer is repairable and I also dont know if I have now wiped out anything that may have been store on my hard drive! AUUGH!!! Am I aloud to post video here? This is my computer. The screen works; I forgot I had disconnected the monitor when I recorded this. http://www.youtube.com/watch?v=Hq6F3x3d-ok I'm having a very bad day.