Question Cpu not detected, cpu or mobo?

May 21, 2020
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So, I recently was helping my cousin upgrade his system, we bought all the correct components and when I assembled it nothing posted, not even a loading screen. The motherboard is shaping a ‘CPU not detected’ light. I understand what this means and easiest idea is replacement. However, is this a faulty cpu or is it a motherboard problem, I’m unsure how to test this.
 
May 21, 2020
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what did you upgrade? did you have to flash the BIOS before installing the CPU?
Hi so it was a big upgrade, we upgraded everything except the hard drive and PSU. The PSU is capable of running it I checked. I can’t remember the exact models because I don’t have them with me but I know they were the correct sockets and generations.