So I've been fixing computers since I was 11 and I currently have about 10 years of experience with computers, but whenever I build a new pc for customers, everything clicks on my test bench. The thermals, the components, all of them are perfect, also everything goes through 6 hours of testing and benchmarking and when it gets to the customer, something is always wrong. Have you ever had these kinds of problems or am I really just unlucky?