Posted 18 August 2005 - 11:01 PM
You never want to power up a power supply with no drives attached. There needs to be a load on the power supply for it to function correctly and it can be damaged. At least one drive should be hooked up to it. Some power supplies have an internal load to compensate for this, but it's a good rule of thumb to have a load on a power supply - this does not include LEDs, which would not have enough load to count.
The 115/230 switch is in case you want to use it in other countries. In the US, you use the 115. Do not experiment.
The switch with the straight line and the 0 is the power switch - on or off. A few power supplies don't have it, but most do. When working on an ATX motherboard, you must have the power supply unplugged to prevent shorting something since ATX motherboards are always powered up when plugged in and turned on, even if the computer is "shut down."