i ve been having numerous problem with my 2007 edition i mac. It freezes or crashes many times a week.I ve done a clean re install of snow leopard to no avail. I ve brought it in, it passed all the physical tests.I was told that they change the memory bar, in case that cased the problem. 2 days later it crashes again. No one seems to know what is the problem. anyone has a clue. thanks for any input.