Mac video problems are bad news for iMacs and Macbooks and could signal it’s end-of-life Slow Macs that show distorted screens or fail to start properly are usually caused by a failing Video or Graphics Processing Unit (GPU)   If your device is under 5 years old, Apple may still carry parts and it can be fixed. Over 5 years old and your only solution is second-hand parts that usually have no guarantees attached. If you have Video issues and the Mac or Macbook is older than 5 years old, it may be time for a new one. Dont use second hand parts unless you can get hold of them cheaply from a reliable source. Some Mac have been recalled with Video Issues in the past, check this link to see if your model is one of them. https://www.apple.com/au/support/macbookpro-videoissues/ See… Why is my Mac So Slow?? On rare occasions we have second-hand GPU’s in stock or can source them from overseas, so please contact us below if you have this issue. :jk: