my mac is a little over a year old, and 2 months out of warranty. my screen keeps messing up, it doesn't happen all the time, but randomly there will lines across the screen and i have to shut it down for a minute to get it back to normal. i know it's either a problem with the lcd screen or the logic board, but is there anyway for me to figure out which one it is before i send it into apple? also, if it's the logic board am i fine with running my computer the way i am without getting it fixed, or do i need to send it in?