OK, something went wrong after I gave it to my daughter! The monitor's built in speakers work fine and the headphones work fine. When I unplugged the headphones the monitor speakers would begin working, when I plugged in the headphones something pops up and I click on headphones and they begin to work. All as it should.
So I gave the computer to my daughter. I was showing her how when you plug in the headphones to click on headphones and it switches from speakers. I have no idea what she did. But now we must open the "sound" window every time and set which ever one we want to use to default. It wasn't like that before, any suggestions on how to make it work correctly again?
CyberPowerPC Gamer Xtreme Desktop
NVIDIA GeForce GTX 960 graphics
Intel Core i7-4790K processor
AOC E2752VH 27" widescreen flat-panel LED monitor
Microsoft Windows 8.1 64-bit