So right now I have fix the screen size and just Playing with it. But I'm not getting any sound out of the internal speakers. I have tried both Xbox and Utube Videos. But nothing.
Are you using VGA or HDMI input? If you are using a VGA video connection, did you also connect the audio lead? (3.5mm stereo jack plug at each end) If you did, have you explored the onscreen menus and checked the volume level is above zero? Also, if you have an audio lead connected to the monitor audio input, take the other end, (the jack that would plug in the computer or Xbox audio output), and touch the tip with your finger. Do you hear a hum from the monitor's speakers? If you plug that jack into the headphone outlet of an mp3 player, does the audio come out of the speakers?
A small point... even the cheesiest of cheapo desktop speakers are going to sound better than the little speakers that can be fitted into the bezel of an LCD flat panel monitor. I know. I have an AOC 24 inch monitor.