Retrive your computer and before you attemp to do anything else get a copy of disc Warrior and run it. It just may save your computers life. Then if it works save everything you can.

http://www.alsoft.com/DiskWarrior/

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….