How-to Guides                                                   

When building a PC, one of the final steps is connecting the front I/O cables from your case to the 

. These small pins are crucial for basic system functions like powering on your PC, resetting it, and showing status lights.

In this article, we’ll explain what each pin does and how to connect them correctly.

The Power LED indicates when the PC is powered on. It’s usually located on the front of your case.

Tip: If the LED doesn’t light up after booting, try reversing the connector

The Power Switch is the button you press to turn the PC on or off.

The Reset Switch restarts the computer instantly without turning it off completely.

The Hard Drive LED (HDD LED) blinks when the system is reading from or writing to a storage drive.

The system speaker emits beeps during startup (POST) to indicate system status or errors.

How to Identify the Positive Pin and Orientation





When building a PC, one of the final steps is connecting the front I/O cables from your case to the motherboard’s front panel header. These small pins are crucial for basic system functions like powering on your PC, resetting it, and showing status lights.

In this article, we’ll explain what each pin does and how to connect them correctly.







PWR LED (+ / -)

Function:
The Power LED indicates when the PC is powered on. It’s usually located on the front of your case.

Connection:





Positive (+) and Negative (-) matters.



The cable will be labeled PLED+ and PLED- or similar.



Align PLED+ with the motherboard’s PWR_LED+ pin, and PLED- with PWR_LED-.

Tip: If the LED doesn’t light up after booting, try reversing the connector



PWR_SW (Power Switch)

Function:
The Power Switch is the button you press to turn the PC on or off.

Connection:





Polarity does not matter for switches.



Simply connect the two-pin PWR SW cable to the PWR_SW pins.



RESET (Reset Switch)

Function:
The Reset Switch restarts the computer instantly without turning it off completely.

Connection:





Polarity does not matter for switches.



Connect the RESET SW cable to the RESET pins.



HDD LED (+ / -)

Function:
The Hard Drive LED (HDD LED) blinks when the system is reading from or writing to a storage drive.

Connection:





Positive (+) and Negative (-) matter.



The connector is labeled HDD LED+ and HDD LED-.



Align the positive wire (often colored) with HDD_LED+, and the negative (often black or white) with HDD_LED-.



SPEAKER

Function:
The system speaker emits beeps during startup (POST) to indicate system status or errors.

Connection:





This connector is usually a 4-pin block from the case speaker.



Match it with the SPEAKER pins on the header.



How to Identify the Positive Pin and Orientation











Most motherboards print + and - signs next to the LED pins.



Positive wires are usually labeled with a small arrow one the rear side if the connector.



The motherboard manual will have a detailed pinout diagram — always check it if unsure.



Final Tips





Handle with care — These pins are delicate; use minimal force when connecting.



Double-check before powering on — Incorrect polarity for LEDs won’t damage anything but will prevent lights from working.



Consult your motherboard manual for the exact pin layout.

Explaining each of these front panel header pins, what they do, and how to connect them correctly

Understanding Motherboard Front Panel Header Pins and How to Connect Them

ハウツーガイド

フロントパネルのヘッダーピンそれぞれについて、その役割と正しい接続方法を説明します。

マザーボードのフロントパネルヘッダーピンの理解と接続方法

ゲームとPC自作への共通の情熱から生まれたdarkFlashは、個性的なデザイン、信頼性の高いパフォーマンス、そして革新的な発想を融合させた製品づくりに尽力しています。

PCケース、冷却ソリューション、ケースファン、ゲーミング家具、アクセサリーなどを自ら組み立て、テストし、使用することで、ユーザーが本当に必要としているものを深く理解しています。すべての製品は明確な目的を持って開発され、経験を通して磨き上げられ、人々の組み立て、プレイ、そして創造のあり方を向上させるために設計されています。

私たちの目標はシンプルです。最高のパフォーマンスを発揮する製品を通して、すべてのユーザーに力を与え、限界のない創造への意欲を掻き立てることです。

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Born from a shared passion for gaming and PC building, darkFlash is dedicated to creating products that combine distinctive design, reliable performance, and thoughtful innovation.

By personally building, testing, and using our PC cases, cooling solutions, case fans, gaming furniture, and accessories, we gain a deeper understanding of what users truly need. Every product is developed with purpose, refined through experience, and engineered to elevate the way people build, play, and create.

Our goal is simple: to empower every user with products that perform at their best and inspire them to build without limits.

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