Yeah as my Dad fitted the PSU I didn't think to check something that basic, we eliminated parts one by one thinking maybe a faulty part was stopping it from booting I thought. Then he said wait what is this lead with CPU on it, then I was like noooooo facepalm....
Not sure if I should start a new thread somewhere for this but im having a weird problem, was having it when I first setup when I had my kolink of death PSU, my monitor is new also which is Dell S2721DGFA 27 Inch QHD (2560x1440) Gaming Monitor, 165Hz. Im on Windows 11 lastest updates and graphics drivers. Im encountering this really annoying screen dimming issue, it's almost like my screen brightness or contrast is shifting ever so slightly all the time, sometimes I can really see it shift if I change the window size of a program, but the main problem is it goes to dark. I came across a thread saying it was a display driver bug with Windows 11 and Nvidia was fixed it in the latest driver. Im on that version and still having the issue I even used Display Driver Uninstaller in safe mode and did a clean install of my Nvidia drivers without luck. I think it may be a HDR issue in Windows 11 possibly but im not sure. Turning HDR mode off Windows 11 looks awful on my display even if that was to fix the problem. I have checked night light is disabled, I tryed disabling the game bar, I've looked for all kind of dimming and brightness options in Windows but Im running out of ideas. The only thing I could think of is my actual monitor doing something but I can't see anything obvious in the settings that would be causing it....