I tried to use a plug and play usb audio card in all 10 ports. did not work despite all ports active and device powered. but no audio at the headphone port. In the process of trying, the REALTEK HD AUDIO MANAGER is now missing. when I plug a headphone into the front port the screen no longer appears. at the same time the overall volume is now noticibly lower. all volume are now at 100%. when the manager WAS there 100% was too high, produced clipping. 60 to 80% was sufficiant. I suspect the manager had an effect on allowing a lower setting. I send both audio and video to the tv. the tv volume needs to be increased to compensate. the small speaker amp connected to the same line out is not effected. how do I download the manager alone? so far failed 3 times from various sites.do I need to update the audio driver? currently version 6. if so how? I would rather have the clipping at 100% so I could reduce volume at various sliders as before and reduce tv volume as well. solutions?