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I have a motherboard, that requires a DC input. The manual has this:

Polarity

I'm trying to find a power brick, but all bricks I can find usually have +12V/-12V on pins or shell and no ground.

enter image description here

Can I use them? Or can I modify them?

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This is exactly what you need, "-12V" goes to "GND", and "+12V" goes to "DC_IN". You don't need to modify anything if your have the pinout shown in your second picture. This is a common wiring for "Power-DIN" connector. Keep in mind however, that pinout of power supplies sometimes use different pin assignment.

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