My MacBook Pro (Retina Late 2013 13"), is making wierd noises. If it's sleeping, and I wake it up, there is a tick sound as the screen turns on. When GPU activity is high, it makes ticking sounds when it heats up and when it cools down. It's not the fan, it is working just fine. Any ideas? Could it be a GPU failing? Hmm, having some more problems. Whenver im on 1/16 brightness, I hear a buzzing sound coming from under the 3 and 4 keys. I've seen my mac opened before, and I suspect that its coming from the gpu. really confused now. Wow, I just ran the hardware test (not plugged in), and it said there might be an issue with the power adapter (its not even plugged in what), and that the power adapter wasn't tested. It also gave error code #PPT004, the battery requires service it said. I'm running fine at 92-93% health and 334 cycles, what is going on with this mac?? --- Post Merged, Mar 1, 2016 --- Another thing, if you can also answer this : So, about a month ago, my MacBook Pro Retina 13" (Late 2013) display died. When I went to an authorized service provider, they tested it out and said that it needed to be replaced (the display). They said that it would take a week before the display was shipped to them, and in the meantime, I could use my MacBook Pro on an external display. A year before this (around April 2015), my display had died, but it revived itself overnight somehow. I used it on my external LG TV, and after it revived itself, it used "HD-709 A as the default color profile, and even if I changed it back to "Color LCD", the HD-709 A would stay on the login screen. Now, I went home after seeing the service provider and used the TV as my external display. After I got my computer back from replacing the display, I saw that the same thing had occured. I dug a little deeper into ColorSync utility, and now, the main display is called "LG TV", even though it is on the internal display, in systeminformation, it shows a built in retina display (but in ColorSync utility, it says LG TV is default, and the internal Retina one doesnt even show up, and the default profile for my computer is again HD-709 A. In System Preferences, however, it is called "Built-In Retina Display". I can still use Color LCD, but the TV's main profile is stuck to the computer for now. When it happened the first time, a reformat fixed it. Is there a way to make ColorSync utility recognize that my internal display is default and completely remove the external one?