Hi everyone, just wanted to get some advice and see what other peoples experience's are with the late 2013 retina macbook pro's. I purchased a new macbook pro online around a few weeks ago. The unit was delivered and everything was fine. A week and a half later I noticed that the computer base was producing a high pitched whining noise, I took it back to my closest store - they replaced it with no problem. The second unit didn't have this same problem, but after a week I noticed that the screen would flicker in a line intermittently. I took it back to the store and the geniuses said that they are unsure why this is happening, but they wanted to replace it incase. Great, so three computers later and I'm starting to get a bit paranoid with my new computer having problems. The new unit has neither of the above problems, and the screen actually appears to be more white and has a less "yellow" tint. However, being paranoid I decided to run the image retention test to check the screen. After 3 minutes there is very minor image retention of the checkerboard pattern, and again testing after 10 minutes you can slightly make out a checker board on the grey background. At the moment I really don't want to go back to the Apple store for a third time, and at the moment the IR is not bothering me with general use. I am, however, worried that this is going to get worse with time (which is what I've read online). Can anyway give me any insight into what I should do? Will IR get worse with usage? EDIT: I also noticed that out of the brand new box the battery had 12 charge cycles.. Thanks!