When you check the playback options, is the realtek audio device set to the default device?
And your speakers / headset, are they using 3.5mm jack plugs, into the green audio socket?
Green 3.5mm jack (headphone / left+right)
Pink 3.5mm jack (Mic)
Must not be using a combined Green+Pink jack like on some PS4 headsets.
Not sure about the CPU pin, the audio processing for the realtek device is done on the motherboard.
And for a pin to be bent on that CPU would imply a tight / uneven fit into the CPU socket.
Worth checking to be sure.
Does the Realtek control panel detect when you plug / unplug the jacks?
Running Windows 10 and is it a clean install performed on this motherboard?