Rtoder209 :
And i want to know how to get system sound through my monitor
Are you using the HDMI for your video signal, or are you trying to use it just for audio? If you're only wanting it for audio, therein may lie your problem. HDMI requires a video signal in order to send audio, even if it's just sending a constant blank/dark image. You would need to set your motherboard's HDMI out as your video device if you want to use its HDMI audio. It would be simpler if your monitor has a headphone jack and you can just split the audio from the audio output jack, and have it go to your headphones and monitor at the same time, and just unplug the monitor end when you're using your headphones.