The button felt mushy, disconnected. He opened the side panel and peered into the green landscape of the motherboard. Near the bottom corner, printed in tiny white ink, were the characters: The Hunt for the Pinout
These are 9-pin headers used for front-case USB 2.0 ports.
Before connecting anything, identify the header.
If the PC won't start or keeps restarting, you may have swapped the Power and Reset switches or connected them vertically instead of horizontally.
He reached for the power button. He pressed. Nothing happened.
It is often easier to plug in the bottom row (HDD LED and Reset) first, so they don't block your view of the top row. Identify Polarity: Look for a small triangle or arrow