Hi everyone! Thanks for reading this. I don't usually use my Quicktime Player to open my video files but sometimes there are some files I receive via e-mail and by default I open them with Quicktime Player. Just some hours ago that happened and I opened the file, but I noticed that there wasn't any audio. The equalizer on the bottom right corner made some waves so I think there should be sound but somehow it is not being played through the speakers. I checked the speaker volum level on the application and on my mac, they both are high so why I don't hear the audio. Please help me because it's frustrating when I see an application doesn't work perfectly. Please help me to fix this problem. Thanks a lot.