black screen for about 5 seconds and then it turns back on without sound

Im having a problem after updating my AMD Driver today when i start up my computer. When i start watching a video on Youtube for a few minutes, my screen turns black for around 5 seconds and then it turns back on. When i try to play a Youtube video after this happens, it just buffers and when the video does play, there is no sound and its choppy, but when i switch to my computer using my headset's audio, everything works fine. I went to my playback devices and it says "AMD High Definition Audio Device Not Plugged In" as well as "Realtek High Definition Audio Device Not Plugged In". I have no idea why this is happening, please help