[SOLVED] PC not booting after CPU upgrade

Apr 20, 2020
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I recently upgraded my CPU to the i9 9900k, my Mobo is the MSI Z370-A Pro. From what I've read it should support up to i9 9th gen. My previous CPU was an i5 9th gen and that worked fine.

When I turn on my computer it freezes on the boot screen. I can get into the BIOS/UEFI and the Boot menu but I can't actually boot into the OS.

Any ideas why this might be or what I can do to fix it? This is the first time i've ever upgraded a cpu.