The integrated (built-in) network card does not work. How to fix?

Question

Iron

I disassembled the computer, changed the video card, assembled it, the Internet stopped working. Found that the PC does not see the network card. Changed video card.

Answer 1

look for a connector that is marked with the number 2:
If you can’t find it on the motherboard, then look for the parts that turned out to be superfluous during assembly =D

Answer 2

On the motherboard

Answer 3

it's either built into your motherboard or it's a bar that sits under your video card or above your video card.
If it is built into the motherboard, then you will see the input for rj45 (lan cable) behind
it, the same with the bracket

Answer 4

Or, as mentioned above, look in the BIOS, look on the Internet where the network card is disabled in the BIOS. reinstall the drivers (preferably from the manufacturer, not some DPS), if it doesn't work, then the PCI expansion card only remains with the LAN port)