Mine has been doing the same thing since march
It happened JUST before the warranty went out, i snapped pictures and everything. I called apple and told them, however it was a few days after warranty. They so "graciously" sold me applecare, $180 with student price. well, this is the third MAJOR issue i have had. They replaced the entire topcase (mouse/keyboard) and also the hard drive has failed. I asked that they replace the machine because it was the third major problem, therefore making it a lemon in my eyes. however when i took it to my authorized servicer they could not reproduce the problem, they had it for a week and couldn't reproduce the problem. The only difference is that mine is on the right of the screen, crazy huh. i have also seen pictures of it in the middle of the screen. this is really killing me because i need this computer to work! i am a web designer and i can't go without my computer for very long! I need to get this fixed, it doesn't happen for very long, but when it happens it wont go away! how can i reproduce this problem for them to see? i show them a video i took on my iphone with the serial number so it proves it is happening on my mac. and nothing. I thought applecare was supposed to provide helpful assistance, they dont. i just want a computer that works. since owning my mac for about 15 months, i have been without it for a total of about 3 weeks, plus i need to take it back in to see a different servicer to see if they can "reproduce" it. what can i do to make it be reproduced!?! is it the lcd or just a cable? i asked the first servicer to check all the cables and supposedly they did, but who knows. any help would be appreciated. thanks!