MacBook Pro, Late 2011 2.5Ghz. The Mac works perfectly fine, however, every so often, the Mac simply freezes and doesn't respond. Therefore I turn it off, and when turning it back on weird lines appear.

The Mac loads up and then shuts down again as soon as the loading screen ends. We tried replacing the RAM because we recently had a RAM issue, but that did not fix anything. Has anyone had a similar problem?

  • Better if you show us an image. Also could it be that there is dust on the RAM connectors?
    – Bradman175
    Jun 29, 2016 at 21:28
  • @Bradman175 It cannot be dust between RAM connectors I replaced them yesterday, I will upload a picture ASAP, I'm just away from home until tomorrow Jun 29, 2016 at 21:51

2 Answers 2


I am suspecting that you have a GPU failure.

"Weird lines" while booting is indicative that there is a problem with the video. Below are a couple samples of the weird lines similar to what I have seen in my travels.

enter image description here enter image description here

However, the best way to test this out with with Apple Hardware Test (AHT). Hold the D key while booting from a powered off state with the AC adapter connected.

It will run through a series of diagnostics - I am pretty certain that you will find you GPU is failing.

Apple Has a Replacement Program for GPU issues. If your GPU is in fact failing, Apple has a repair extension program where they will repair, for free your Macbook Pro. From the details you provided, but check with Apple to be certain. The program runs until December 31, 2016. See the link for details

  • My lines look a little less messy than the first picture. The only problem is my lines disappear after the mac is rebooted a couple times. Does this also happen with these ones? Thanks for the reply, Jun 30, 2016 at 7:52
  • That's pretty typical of a GPU failure. I had a Mac that would function perfectly if I let it "cool off" for a 30 mins or so. After it got warm again, the lines would reappear. I had the GPU chip replaced and the problem went away for good.
    – Allan
    Jun 30, 2016 at 11:20

You should take the computer to an Apple Store. Any sort of distortion is covered under the Graphics Card replacement program. They have a test they run to verify! Good Luck!

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