I have a box of five routerboard 333s that won’t power up with an AC adapter OR POE. The Lot/Serial Number: 179801FC3B46. Item # is: MTK-RB/333. Do these boards require a special POE adapter or inverter to work properly or did I just get a batch of bad ones? The cards are about a year old.

Use regular 24V; 0,8A PSU Check it with other RB before use. If you don't see any lights that's mean it is broken. Contact with your supplier.