My friend has been experiencing problems with his MacBook recently. The machine powers on but at some stage, usually during the boot, it will freeze and the display will look as pictured with black and white horizontal blocks on screen, arranged in 5 columns. Very occasionally it will boot all the way to open the user profile and allow a few minutes of normal use before the lines appear.
Apple Hardware Test doesn't highlight a problem. On the couple of occasions that macOS Recovery did load, Disk Utility ran First Aid without any errors.
We would like to know is the odds of a hardware problem e.g. graphics chipset or logic board?