Any speaker LEDs will have their own wire harness and power supply, and it entirely separate from the audio wires that carry the music.

Start at the amp. Is there a power light on? Is it red or blue or green? Red typically indicates a protect mode, where as blue or green are the typical colors used for normal mode.

No light could mean the amp is toast or there is no voltage on the power cable, low voltage or no voltage on the small turn-on wire. Red light can mean the amp is toast, low voltage, high voltage or shorted speaker.