motherboard pin connection (power sw,etc)
The header is somewhere in the bottom right corner of your motherboard ... in the picture, it's under the video card and somewhere below that heatsink which has ASRock written on it.
The headers are pretty much standardized, should be the same pinout as on other motherboards from Asrock, so you can use the manual linked above to inspire yourself
For example from page 15 :
and page 29 zoooms it out :
LEDs care about polarity - if you insert it the wrong way, nothing bad will happen, but the led won't light up. So you can just turn off the PC and flip the connector so that the wires are the other way around. But traditionally, plugs should be inserted with the text on the outside, if there's any label or something printed on the plug.
The button / switches (power switch , reset switch) don't care about polarity , it's a momentary buttons, you connect the two pins together when you press button. So it doesn't matter which way you put the connector in.
Don't forget to connect the power to your video card and your CPU and don't forget to make the absolute noob mistake of not having spacers between the case and motherboard (most cases have spacers pre-applied - the motherboard bottom should not touch the case, and spacers should only be under motherboard screw holes.
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