Hi here's my problem - Sometimes i hook up my macbook pro to my LCD tv to watch movies and the video is fine but when i hook up my audio cable there is a lot of high pitched screechy noise that comes from my tv's speakers. I don't think the problem is the cable because there is no noise until it is plugged into the computer. I'm looking for a cheap usb to audio adapter or if someone knows how to fix this otherwise, let me know. I looked on ebay and there are some cheap ones but none state that they will work for mac. Also i think the Griffin imic is too expensive for what i need it for. Any alternatives? Thanks!