66D-Link DHP-W306AV User Manual
Section 6 - Troubleshooting
This may due to the accidental change of the device password. Use the web-based conguration utility and select 
 > . Fill in the password in the blank. Then repeat the same procedure to the other Powerline 
AV device via web-based conguration utility.
Please check your power  supply is working. Powerline  AV device operates  from the power supplied  by the home 
electrical wiring and can not operate without a working power supply.