MacBook Pro External Speaker Hum With External Display

When I plug my MacBook Pro into a set of external speakers, I get a loud-to-deafening hum depending on the volume that the speakers are set to. However, this only happens if I have an external monitor plugged in. I unplugged the macbook, and this did not stop the hum, and I turned off the extra display and this did not stop the hum, neither did actually unplugging it from its power source, the only thing that stops it is taking the vga cord out of the displayport to vga adapter.
Any ideas as to why this hum happens? It's not always just a static hum either, occasionally there are crackles, like from a record or something.

thinking that you are using a stereo cable 1/8" to 1/8" there can be a few explanations to that .. one the cable could damaged internally mixing audio signals .. or it can be that the wiring diagram is a bit off ( the jack has 3 connectors on it ) ..or the input you use on your speakers were not meant for a stereo cable .. the jack input you use on your speakers could be damaged ..or that hole you plug them in was not an input at all
Now that you are over the problem .. These don't really matter much ..
Take care

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Hey Renecek,
My first thought was, "Hey, you are using closed-clamshell mode".
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
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Κοσμά τι λες; Τα έχεις μπερδέψει. Άλλο συζητάμε εδώ. Το ότι δεν μπορείς πια να δουλεύεις μόνο με την εξωτερική οθόνη (να έχεις σβηστή την ενσωματωμένη οθόνη όταν έχεις συνδεμένη εξωτερική).

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MacBook Pro External Speaker Hum With External Display

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