i just got a new lower-end mbp 3 days ago, it was prefect i was really happy with it. (it really put me off when i read all of those thread, i must say i had my doubt with apple) i have been using it pretty much for the whole day today from around 10am to 5pm, nothing really fancy, i was just online chatting with some friends and reading some news, that was it! no high graphic demand, no game whatsoever!!!! and then, i realised that the screen started flashing once a little while, top half of the screen went black and flash back to normal. At first i thought it was not a big deal, but it has been doing it for more than 10 times for the whole day. i really don't know what to do??? it is not a very noticeable problem as you will have to sit down and play with it for a good 20-30mins, it may flash for a sec and then back to normal. Can any pro here help me out with this problem, is that a big deal or just me overreacting??? please help!!