For LED connectors, the positive (+) wire is usually colored (red, green, or blue), while the negative (-) wire is typically white or black. You can also look for a small arrow symbol on the back of the plastic connector, which indicates the positive side.
Marking rubric (brief)
The board was green, austere, and—most frustratingly—unlabeled. He had the case cables in his hand: tiny, fragile two-pin connectors labeled , Reset SW , HDD LED , and Power LED . But looking at the bottom right corner of the motherboard, he saw only a jagged forest of naked gold pins. acer ipisb-vr rev 1.01 front panel