[SOLVED] Upgraded from a ryzen 5 2600 to a 3600, now my PC won't boot and my GPU won't start

Jun 19, 2020
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I upgraded my CPU from a Ryzen 5 2600 to a 3600, but now my PC won't boot- I switched back to my 2600 to try updating the BIOS but when I switched it still won't boot-
So I reset the BIOS by removing the cmos battery and just put it back if after 30 minutes and it's still not booting-

The GPU now doesn't turn on

My 2600 was put into my brother's PC for an upgrade and the same thing has happened to his PC

Mobo: Asus prime a320m-k
GPU: in the Radeon HD 4000 or 5000 series, but not sure on model (temporary, switching to an RTX 2070S, also yes I know I need to upgrade my mobo)

Any other ideas on what to do ??