If it was that easy to replace chips most computer companies would go bankrupt…thats how they make money…knowing the end user will do the stupidest thing that’ll cause it to die…thus making them buy a new one making the company more money. When you say turn on and run for a few mins do you mean initially or after it cuts off once and you start messing with it? If you mean the first time then it’s a overheating problem…the second one can be a combination of both overheating/fried chips