I admire your technology. The 20+4 pin power supply port on the motherboard needs to be correctly connected to the 20+4 power supply socket on the motherboard, and then the computer motherboard can work normally
The white one is called DVI HD signal cable. The black one is HDMI high-definition signal cable (both DVI and HDMI are high-definition cables, the only difference is that HDMI cable is DVI with sound, and DVI without sound) The green one is called VGA signal cable If you want to find a power cord, it should be the hole on the left of HDMI. This is usually an external power supply of the adapter. It is usually connected to a 12V4A power supply