amd r5 5600g

So 3 days ago I took my gpu out of the computer to have it cleaned up, and tried to boot up with the igpu, but got nothing, so I plugged the gpu back in and tried again; still nothing. Tried different sets of ram in all slots, that I'm sure are working, no post. Tried disconnecting all...

I changed a computer processor from amd r5 3600 to amd r5 5600G. I updated the BIOS to F13 before changing the processor and the computer started and when I wanted to play some games I found vram 512m. So I decided to change it from BIOS (I have 8GB Ram) so I made it 1gb but when I saved it .it...