My Mac Pro has a problem that cannot be fixed with repair utility. I am looking for help here. It's a Xeon. Input/Output as I typed in the subject line. I am over from PC and do not have a clue as to how to give the proper info for you to help me. I do not want to replace the disc if it can be helped. At least, ask me the questions that will help me communicate properly to you. Does the subject line help at all?