Some models do not use automatic worldwide AC switching power supply and therefore require that the AC switch be set to the correct voltage. There are only two positions for the AC switch: 100/115V or 230/240V. Use the tip of a pen to push the switch either Up or Down firmly. It is located near the AC socket on the back panel.
All items shipped from the factory are set to 230/240V by default.
Use energy saving power strip such as "Tripp Lite 8 Outlet Eco-Surge Protector Power Strip" where turning on the master device will turn on all the source devices. Tripp Lite power strip also comes with good noise filter. Another type of power strip such as "Belkin 8-Outlet Conserve Switch Surge Protector with 4-Foot Cord and Remote" is also highly rated by consumers.