Macbook Alu late 2008 OS X version 10.9.4 SSD Samsung (a couple of months old) Incident: the audio output is suddenly 'corrupted'. Its like its ill, like it has a scratch in the throat and somewhat slower. How it happened: I listened to few music files when the sound was OK then I turned off Macbook. I turned back on, I copied some music files from an external HDD and then the sound was no longer OK. It was not OK on either the new music files or the previous files I listened to before. I tried to open the files with different software like VLC, Quicktime even with spacebar (preview) and still its not OK. I also tried restart. Could it be the hardware ? I doubt it could be a virus. Or could I have pressed accidentally any shortcut to make any changes ?