My friend is building a PC for the first time, and when he pulled out the motherboard the Ryzen 5 2600x was already pre-installed into it. He bought the parts as a bundle (https://www.awd-it.co.uk/asus-prime-b450m-a-amd-b450-ddr4-matx-motherboard-socket-am4.html). After he finished building the computer doesn't POST. Could this be due to the CPU? He's tried everything to fix it and still no luck.