MacBook – Whiter screen on MacBook Pro 2014

Let me summarize the troubleshooting steps.

Before disassembling:

1- Run the Apple Hardware test to see if it comes up with anything.

2- As far I know you have a NVIDIA graphics car. Run without it to test.

3- Connect a external monitor to test if the internal display is failing.

4- Open up the computer and unplug/plug the Video cable few times to clean the contacts. Or replace the Cable following the instructions here.

No, you most likely have the very same common GPU issue. Seeing the glitches multiple times is a sure tell sign.

Beneath all that drama caused by resetting and tweaking things, temperature variations on the GPU contacts were what caused the glitches and the inconsistent behaviors. Your laptop is probably in the initial phase of GPU(soldering) failure. Sooner or later the problem worsens and more severe graphic glitches will appear or the computer simply becomes unbootable.

You can try the simple steps below to stress-test the GPU, but by doing so you could be accelerating the problem and end up in an unusable state sooner. You can decide if it's in your interest to forcefully trigger the problem. Regardless, these steps are not beyond any normal operating parameters, so if your laptop is immune from the GPU problem you are not doing anything harmful by performing these steps, warranty-wise especially.

1. Get a temperature & fan speed monitoring app like iStat Menus that can show you fan speeds, CPU and GPU temperatures in real time.

2. Run a GPU benchmark app to stress the GPU. Valley or Heaven should work, for free. Keep running/looping so the GPU temperature stays around 70'C or higher, for as long as possible (hours).

3. You should pause the benchmark app periodically for the temperature to drop down (back to 45~50'C range). Or just turn it off at nights. Repeat the heating/cooling process until the symptoms appear.

This test might end up proving nothing, and yet it doesn't mean the GPU is trouble-free. It takes time and many temperature cycles for the solder joint problem to become apparent.