Your YouTube video link shows that the system is only seeing 12GB of the 16GB of RAM. When you changed the graphics card did you clear the motherboard's CMOS?I7-4770s 3.10 ghz
Gtx 1050ti msi
16gb ddr3 ram
Is all i know in my head but i cab look into it when i get home. Also its an asus g2 PC with changed gpu.