hello everyone i just bought an ws2812b led strip (3metres)and i tried to connnect it to my motherboard but wrongfully i connect it to 12v 4pin port and i realized it doesnt work then i changed it to 5v 3pin but now only first and end 4-5 space lightning solid please help me sorry for my english btw
This is the Arduino forum.
Is your question related to Arduino?
no idk about this forum i just wanted to ask my problem my leds doesnt work
why do you not ask it on veterinary forum?
You may have permanently killed it with 12V. 
I have no idea how to control an LED strip from a motherboard... They are normally controlled by an Arduino or other microcontroller where you have I/O pins instead of I/O ports.
5V from a desktop power supply from a computer can probably supply enough current, but it's also powering the motherboard and everything else so you might need a separate power supply. "Worst case" at full-brightness white, the LEDs need about 60mA each and that can add-up to a few amps for a strip and that means you need a hefty power supply.
Adafruit has TONS of information about using WS2812's (which they call 'NeoPixels").
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