This happened to me and I had one of a batch of faulty graphics processors (NVIDIA). apple replaced it for free so worth taking it to them and checking if yours is one of the models with the dodgy cards.
Fix the Planet Repair is recycling! The best way to keep electronics out of landfills is to keep them working longer. Toxic electronic waste is a global problem that we are working to solve. Self repair saves you money and helps the environment!
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