ATX stands for “Advanced Technology Extended“. This is the standardization of the latest computer packages. All computer components, which are also standardized to ATX can be installed in this housing. ATX power supplies support the latest additional features that bring any modern computer with it. The different types of PC power supplies differ mainly due to equipment size and the number of available slots and ports. To meet the ATX standard power supply, it should at least provide a voltage of two 12 volt-rails, and a +5 volt, 3.3 volt, 12 volt rail and a standby power.
However the I / O components is defective, they can not be easily replaced because they are on the motherboard. Also, the computer consumes electricity even in standby mode. To turn off completely, it can be done through the main switch.
Many modern PC power supplies in ATX format are now able to work with different electrical networks. Some must be activated manually, but this is dangerous, if wrong in doing this the PC power supply will be damaged forever. Another device can automatically adjust, and allow the AC voltage from 100 volts to 240 volts.