How to convert an ATX power supply to rc use
Please note that the high voltage wires that come in from the socket in the side of the PSU should be avoided at all costs! Don't cut them, join them or touch them.
The only wires you need should be bundled together and sent outside of the case.
Identify these wires and ONLY use them, don't grab any other wire that resides inside the case.
Please note that 'brown' is not a very common color on power supplies.. it is on some.. but unless you make sure you know what the wire is, don't tie it to anything.
Do you still have the connector for the power supply? The part that mates to the motherboard?
You can verify the colors by looking at a pinout for that connector. Colors are not a reliable method.
The wires you should need are as follows, and will be part of the wire bundle that exits the PSU and goes to the largest connector.
Yellow - 12V (Ignore the Yellow/Black stripe for now)
Black - Ground (0V)
Green* - Commonly green, not always! Labelled as 'PS-ON' when you google an "ATX pinout"
Please grab a meter and test these wires before using them. They are common colors... but you must always be certain.