Chosen Solution

Hello. Macbook is having weird display error. The error comes up randomly and restart the PC itself. Screen is shaking, 5 cm bars will come to the display. Someone have experienced similar issue? Gpu ? Display itself or bad ram? Update (08/02/2021)

Picture once more. Update (08/03/2021) Did the RAM reflow and now the macbook boots up fine. Is there any way to test is it coming back or i just need to wait?

The integrated graphics engine within the CPU chip uses part of the systems RAM for video RAM so what you are seeing is the corruption of the video image within the video RAM space. Basically your RAM has a problem so you’ll need to find someone with the needed tools and parts to replace the RAM chips or I would get a replacement logic board as being the quicker path MacBook Air 13" (Mid 2012) 2.0 GHz Logic Board and here’s the guide MacBook Air 13" Mid 2012 Logic Board Replacement

@kapuzta Yes, 3 beeps means bad RAM.