Hello, I am asking for help with diagnosing a system that a friend gave me. It has a I5 7400 in it and using the integrated graphics, or a spare hd 7470 I have does not get a display. Another thing is when the gpu is not installed it makes a loud screech or hum noise, that comes directly from the motherboard. I'm guessing it's rather the cpu or mobo but I could be wrong. I can provide photos if it would help any. Thanks!