My ATX power supply doesn work. What is wrong?
Please try the following: According to Intel specified ATX design, an ATX power supply WILL NOT power-up without being connected to an ATX mainboard or a specialized ATX power supply testing device. In addition, the wires coming from the front panel power switch must be correctly attached to the 2-pin connector on the mainboard according to their polarity. Please refer to the documentation that came with your mainboard for the location of the power switch connector pins. The 20-pin power connector from the power supply must be firmly connected to the mainboard. The voltage selection switch (115/230 volts) on the back of power supply must be properly set to match your local voltage (115V for the US market). The most common cause of an ATX power supply not functioning is improper installation of the wires that go from the power switch to the mainboard. UNDER NO CIRCUMSTANCES SHOULD THE POWER SUPPLY COVER BE OPENED. THERE IS DANGEROUS HIGH VOLTAGE INSIDE. DO NOT try to repair the power su