Yes it could be that the default factory settings of the bios of the A88xm-e45 motherboard it is disabled.
On power up of the system you need to repeatedly tap the key that corresponds to entering the bios via your keyboard.
This can be the.
F1 key
F2 Key
Delete Key.
F10 key to F12 Key, on the keyboard.
Set the option in the bios for the Ethernet adapter to enabled, and save the settings in the bios before you exit it.
If you find the option in the bios is already set to enabled, then it may be a case that.
A: the cable you are using has a broken twisted pair of wires used causing the Lights on the Ethernet of the motherboard not to light up, try another cable if you have one.
B: One of the ends of the Cable with an RJ45 connection is not fully seated in the motherboard socket of the motherboard , or the router device used.
Check both ends are fully seated in there Sockets.
Or in windows you have not setup a new network connection first, for you default home network ect.
The option to do so can be done in windows via the control panel, and network and sharing options if so.