Previous Technical Preview builds my screen was real dim and the brightness was set to the highest. This build the brightness has returned. I tried doing driver updates and i had the latest. I contacted MS and they said it was a known issue. Well build 10049 fixed it and the screen is back to normal. Also I didn't have sound I have the Realtek High def sound driver. Well I was playing with the setting under properties and I saw a setting that toggled between surround sound and stereo. On the side there was a test sound button that was disabled. I switched the toggle from surround sound to stereo and the test sound button was enabled. I clicked it and it did a speaker test. I then went to Youtube and played a video and I had sound.