Considering of buying the new 15" i5/2.4 MBP from a 3rd party retailer. Been told that they only have a "demo" units in stock (???), apparently all in original packaging / unused condition. Since I don't have a great experience with them, I am trying to be rather cautious here. So is there any way I could tell from the opening, if the unit is 100% factory new and not been previously open? Will try to do a quick in-store check (if they allow me to do), so what would you recommend to do? Thinking of: - Dead/stuck pixels - Signs of reported yellow tint issue ??? Would try to convince them of starting the OS, should there be any problem perhaps? All comments are highly appreciated.