Broken glass and black displays -- not exactly the thing you want to see on a $2,000+ computer you just sold an organ for and waited what seems like eons. Reports from around the web are slowly trickling out this morning as more and more Core i7 Mac users start receiving their units. While not extremely high, the number of reported problems with either cracked glass or a unit simply refusing to turn on is above normal. Apple is supposedly replacing the units quickly and without much question ...