Why won't external speakers work with my MacBook?

I've had my MacBook for awhile now. For the first time, I tried plugging in some external Dell speakers that I had used with my old computer. The instant I plug in the USB, my MacBook shuts down. Why is this?

Maybe the speakers are not compatible with your computer.  Contact the manufacturer.
You can try Resetting your Mac's PRAM and NVRAM to see if that resolves the issue.

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