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The wires from my case are as follows
Power LED + , Power LED - , Reset SW (2 holes) , HDD LED (2 holes) , and then there is a seperate wire listed as Power SW, and it has 2 holes.

The motherboard pins are as follows:
HDLED+ , HDLED - , GND , RESET # , Dummy , PLED + , PLEED - , PWRBTN# , GRND

Please help me match these up.

Also how do I know where to put the HDD LED since the wire is not specified which hole is + and -.

And does dummy mean that I do not put anything there. (and don't call me a dummy) :lol:

Thank you very much

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  • Latest Post Latest Post by nizzy1115

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A short, practical follow-up for that builds on 's suggestion: swapping an LED to check polarity works, but a few simple checks make the job faster and safer.

Power down and unplug the PSU first. Locate the motherboard front-panel header in the manual (often labeled F_PANEL or FP1) and note pin 1 from the silk‑screen or a small triangle on the PCB. Momentary switches (power/reset) are simple contact pairs and are not polarized; LEDs are polarized and must be placed on the board with the correct orientation.

Ways to identify the LED polarity without guessing:

  • Inspect the small plastic connector for a molded “+” or for a colored wire (often the anode), but that is not guaranteed.
  • Use a digital multimeter on diode mode: touch the meter leads to the two wires in the LED connector. A forward-voltage reading (or a faint glow) identifies the anode when the red meter lead is on that wire. Reverse the meter leads to confirm.
  • If no meter is available, a brief test with a 3V coin cell and a series resistor will illuminate the LED in the correct direction. Never apply higher voltage directly.

Common final checklist:

  • Connect the two-pin reset cable to the RESET pair (non‑polarized).
  • Connect the two-pin power switch to the PWRBTN pair (non‑polarized).
  • Plug the HDD LED into the HDLED pins with correct polarity.
  • Plug the Power LED into the PLED pins with correct polarity.
  • Leave any “dummy” or no‑connect pin empty.

If LEDs still don’t light, verify connector seating, inspect the case harness for broken wires, and consult the motherboard manual diagram to confirm pin numbering.

Member Avatar for nizzy1115

The wires from my case are as follows
Power LED + , Power LED - , Reset SW (2 holes) , HDD LED (2 holes) , and then there is a seperate wire listed as Power SW, and it has 2 holes.

The motherboard pins are as follows:
HDLED+ , HDLED - , GND , RESET # , Dummy , PLED + , PLEED - , PWRBTN# , GRND

Please help me match these up.

Also how do I know where to put the HDD LED since the wire is not specified which hole is + and -.

And does dummy mean that I do not put anything there. (and don't call me a dummy) :lol:

Thank you very much

this maybe a little late but hdled stands for hard drive led, pled stands for power led, pwrbtn stands for power button, grnd is ground etc...match up the + with + and - with -...if you dont get the light to work you need to switch it up...nothing should happen if you have them mixed up except that your led's or power switches/reset switches will not function until you get them right.

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