Power Supply, Keyboard, Motherboard, Screen Cable, Inverter,. etc
Motherboard Functions:
IrDA bus: Most motherboards in the market have a connector on the board for the IrDA (Infrared Developers Association) bus that allows the wireless communication between the PC and peripherals equipped with infrared sensors, as some printers and notebooks. In order to use this bus, it is necessary to install an adaptor on the IrDA connector existing in the motherboard that unfortunately is not shipped with motherboard.
Additional USB ports: ATX motherboards usually are equipped with two USB ports in their back side. Some motherboards have more USB ports, but they are not located in the back side but in the middle of the board. To use these additional ports, it is necessary to install an adaptor that will convert the plug format used in the motherboard to the standard format of the USB plug, permitting the installation of USB peripherals in those additional ports. Most motherboards won't come with this adaptor.
Suspend to RAM (STR): You can configure PC in such a way as to store all component information in RAM e power off all components but RAM. Therefore motherboard will power only RAM, keeping all remaining components powered off resulting in a bare 5W consumption when PC is in such a state. The advantage is that when PC is awaken it will be in same position it was when it was put to sleep, holding the same programs and documents that were open, for example. You can even program PC to execute some tasks while PC is sleeping, such as downloading e-mails (PC wakes up, executes scheduled task and goes back to sleep). Some motherboards have a STR connector that allow the installation of a LED that will light when PC is in STR mode and turns off when PC is in normal state.