Fast track pro problem after connecting TV (HDMI)

[Lucassv]

Hi everyone. I'm having some trouble with this device. Everything was fine till I connected my TV to my PC where I also have connected my m-audio fast track pro. My vga has a HDMI input never used it as computer screen till yesterday when I started having this problem. When I started using this TV (Its brand is LG) as a computer screen I noticed that the videos I run on my pc didn't sound or the souns came and went. Sometimes I had to turn the fast track pro off and on ans sometimes not. Also I noticed the Windows opening sound changed its pitch this is weird and funny. Unplugged this TV and connected my lcd screen (no HDMI input) again but the problem persists. Reinstalled drivers of fast track pro but didnt work. I think the HDMI connection made the problem. I'm looking forward to reading your answers. Thanks for your help! Have a nice day.