I have a Macbook Pro (2 years old) that is currently under repair at Apple. It wouldnt boot up after the latest software update .Initial estimates was a 5 day turn around . They have had it for almost 2 weeks and say its the logic board and that the board is on order. This is the 2nd time that the machine has gone back to them following software updates. I need the machine for travelling/work pretty urgently. How long do i wait before they replace the machine? Any advice please.