Hello, for last 2 weeks I have a problem with audio. For example: I'm watching some movie or TV serie from my harddisk or from online website. Audio is OK but after 10-15 minutes audio faded out and it continues very silent. For vision: If you plug some headphones into macbook, you set volume to higher and if you put headphones on the table, you hear sound very quietly. I hear movie/tv serie same after 10-15 minutes and I don't have connected any headphones. Can anybody help me please? I tried to format disk and clean install mountain lion but it didn't help me. BTW I'm using Logic Pro with external audio device Focusrite Scarlett 2i2 but if I watching movies I don't have connected audio device into my macbook. MacBook Pro (13-inch, Early 2011) Original HDD + Intel 520Series joined to Macintosh Fusion Mountain Lion 10.8.4 Please help me. Thank you very much!