Serial monitor is empty

Hi guys, I haven't always had this problem but nothing is showing up on my serial monitor. Even if I use the simplest program the serial monitor is just white. I'm using an arduino zero and my baud is correct, can anyone help?

Is this (host) on a raspberry pi? Or SSH connected?

I'm not sure what you mean, I'm using the basic arduino IDE with an arduino zero.

Sorry, i mean what are you plugging the usb cable into?

The native usb port on the arduino zero.

What i mean is

[Arduino zero] -> [USB cable] -> [What type of device??]

I'm on a mac.

Have you tried using the programming port?

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