Firstly you need the BIOS listed here. https://www.msi.com/Motherboard/A320M-A-PRO/support#cpu
Second you could try reseating the old CPU and resetting the CMOS. If this works, you would then install the BIOS on from the page above.
If resetting the CMOS does not work, you could try using a discrete GPU to get to BIOS, if it is getting that far.
If none of this works, check your connections to the PSU. This happened to me and I just reseated all the cables and it powered right up.
Good luck, friend.
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