So I did some stupid things today.
After messing with the bios, the PC stop booting up remaining in an constat restart cycle. After that I search of methods to clear the bios.
First I took out the CMOS battery and press the power in order to reset the setting. That didn't work out so I found you could flash a new bios version by using Q-Flash with a USB stick without needing the RAM or CPU installed in the MOBO. Now after doing that the PC powered on but didn't POST and I got the CPU light on. In an attempt to fix that I tried to refit the CPU, but now it doesn't power on at all.
I removed everything step by step in an attempt to try isolate the problem by nothing came on. I removed everything from the MOBO except the 24 and 8 pins in an attempt to see if the MOBO RGB light come on at least, but nothing. I tried again resetting the Bios in an attempt to see if I could get any power, as by using Q flash the MOBO powers on and then shuts down, but again it didn't work.
Did I kill the motherboard? I also read that it could be a CMOS battery problem but I don't think is that, I think I screwed up somehow when I refit the CPU. I don't have any way to test the part separately.
PC spec:
MOBO: Gigabyte B550 Aorus Pro V1.0
AMD Ryzen 3700X
Sapphire Radeon 5600XT
16 gb ddr4