I just bought my 13 inch aluminum Macbook a few days ago but its been kind of disappointing. The internet loads really slow and will work perfectly one second then turn sluggish the next. I have to sit in an exact spot for it to pick up my linksys network, even though the other computers/devices in the house have no problem picking up this signal wherever I sit. Just now the macbook suddenly quit on me and told me to restart, then explained that Mac OX quit or something like that. Is this supposed to happen? I paid 1500 dollars for this thing so I was expecting problem-free surfing for at least the first while. Could it be because it was an open box model? Meaning somebody bought it and returned it (the store sends it back to Apple to check it out and reset it). What can I do? Will I get a new one if I were to return it or another open box model?