Problem with ill audio sound, what could it be ?

macbook alu late 2008
os x version 10.9.4
ssd samsung (a couple of months old)

incident: audio output 'corrupted'. its ill, has scratch in throat , slower.

how happened:
listened few music files when sound ok turned off macbook.
turned on, copied music files external hdd , sound no longer ok. not ok on either new music files or previous files listened before.
tried open files different software vlc, quicktime spacebar (preview) , still not ok. tried restart.

hardware ? doubt virus. or have pressed accidentally shortcut make changes ?

 

xpcentric said: ↑

...
incident: audio output 'corrupted'. its ill, has scratch in throat , slower.
...
tried open files different software vlc, quicktime spacebar (preview) , still not ok. tried restart.

hardware ? ...

click expand...

is distorted sound on internal speakers only?
did check sound quality headphones, too?

 

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