Question Red CPU light stays lit, PC not booting up. Ryzen 7 5700X - MSI MAG b550 tomahawk

Jan 10, 2023
I recently bought a Ryzen 7 5700X for my PC. I updated BIOS for my b550 tomahawk to the latest version, before the installation and when I installed it, it just shows the Red CPU light and won't start up at all, CPU and systems fans run, but PC won't boot up. I have been having trouble with this for hours at this point, making sure all my connections from PSU are alright taking out reseating Ram cards, so forth, I was able to get an older CPU a Ryzen 5 1400, and the PC starts up and works perfectly! I am so confused because I have the latest BIOS update so 5th generation CPUs should work, no? I would really like the utilize the new CPU I got and not use this older one I got from a friend, could it possible be my GPU (Radeon RX580)?
Specs :
Ryzen 7 5700x (currently Ryzen 5 1400 as I am troubleshooting)
RX 580
MSI B550 MAG Tomahawk AM4
64GB 2400mhz memory
750W Corsair 80+ Gold