- Connect only one high-power usage device (e.g., IEEE 1394 hard disk) to the 6-pin Firewire port unless it is self-powered.
- The port has a 3-watt maximum power output.
Source: 1820M — v2-1820-1212-en (manual)
Symptoms this guide addresses
Source: 1820M — v2-1820-1212-en (manual)