I have an issue with my Late 2013 Macbook Pro Retina 15” with the dedicated nVidia 750M GPU and either the whole screen or approximately a third and even just half of the menu bar flickers to black whenever the graphics processing is switched between the integrated and dedicated cards, making the machine unfit for purpose. This is easily reproducible by turning the automatic graphics switching on and off in system preferences. It flickers constantly under any type use of the machine, including loading only a single website. I understand that I can use gfxCardStatus to force the machine to stop switching, but I then have to compromise the performance or the battery life of the machine. I am still covered by my 3 years of AppleCare that I purchased and went to my local Apple Store and handed the machine in a pristine condition, fresh out of the cover that it resided in since the moment I opened it, and arranged for the logic board to be replaced. I then received the MacBook back with a fresh install and several scratches, scuffs, a missing screw and gouges on the machine and was told that it was perfectly functional as it had passed all their tests despite being able to easily replicate the issue. After much arguing, we agreed to further testing as I was told that I was pushing the machine too far and a Mac Pro would be appropriate despite the machine being a top of the range machine, ironically with the word ‘Pro’ in its name. I then opened a single website and the flickering occurred and the case was escalated to the engineering team and it was agreed the display would be replaced due to the damage caused to it. I was then told many times that my machine was ready for collection and that the issue had been fixed with no details explaining how, to then arrive with no change at all to the machine, costing me a lot of valuable time and money. Later on I received a phone call and was told that it may be a software issue and that I should wait for an update. 10.11.6 then arrived and was installed, which produced the same issue. I was then told to just keep the software up to date and wait for an update. I then spoke to a few managers at the store and was told that the damage caused to the bottom of the case were ‘wear and tear’ and to be expected, despite the fact that the machine has been in their custody the whole time and that as far as they are concerned the case was closed and I should just take the machine home and wait for an update. I then explained that several other people have had this issue and in 3 years it has still not been resolved by any engineering team and that I should have an update by now. I believe that the issue could be a design flaw in the machine and that after waiting for over a month the unit should just be replaced. Replacement 2015 units have been given to other people with the issue as a resolution and they told me that my case wouldn't be dealt with in the same manner, justified by the fact that they may be from abroad and the law may differ, despite the fact I was actually making a claim via AppleCare like the others have, which would warrant the same service. All managers have claimed that there is nothing they can do and that to justify for a replacement, the repairs done would have to be declared as failed, meaning that any further possible repairs would not fix the machine, even though the manager later then admitted that there would be no repair that would fix the machine. I then questioned his contradiction and he reiterated that it was impossible. He then had the insolence to offer me 20% off a new model as I left the store. Also, they have been ignorant to the remaining damage despite other managers acknowledging its existence beforehand and supposedly nobody at Apple has heard of this graphics issue. I still haven't received an update as to whether if they have fixed the issue or even identified it. Apple seem to be unaware of the issue and would like to know if there is anything else I can do at this point and would also appreciate any suggestions as to what I can do myself to fix the machine. Thanks for reading.