The LED indicator on my power supply is not on and solid. What does this mean?

If the LED indicator on your power supply is off, then you may simply need a replacement power supply.

You can find replacement power supplies for the original A2s and N22 here:

https://audioengineusa.com/shop/accessories/a2-n22-replacement-power-supply/

Also, you can  find A2+ or HD3 replacement power supplies here:

https://audioengineusa.com/shop/accessories/a2-plus-hd3-replacement-power-supply/

However, please contact customer support if the LED indicator on your power supply is blinking on and off. This may indicate an issue with the speakers.