Sound output doesn't work - only builtin speakers

Ok... I just got my macbook for a few weeks.
Wanted to connect my external logitech speakers. Didn't work, didn't even flinch.
Neither do my headphones/earbuds work. I don't see any red light also.. it doesn't do anything, really weird. Anybody else having this problem?

At preferences, audio there is only internal speakers. No output device..
But at input there is the line-in though. Just not at output.

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