http://knowledge.seagate.com/articles/en_US/FAQ/3165enYellow blinking - The GoFlex Net failed to boot up accurately.
Blinking Amber (Yellow) Light
A blinking amber light indicates the FreeAgent GoFlex Net did not boot up properly.
1. Use the reset button located on the back of the GoFlex Net.
2. Reboot the GoFlex Net by disconnecting/reconnecting the power cable.
3. Plug the GoFlex Net directly into a wall outlet, eliminating any overcrowded power strip from the setup.