ATX Power supply Connections
| Pin | Signal |
| 1 | 3.3v |
| 2 | 3.3v |
| 3 | Gnd |
| 4 | 5v |
| 5 | Gnd |
| 6 | 5v |
| 7 | Gnd |
| 8 | PG |
| 9 | 5v Standby |
| 10 | 12v |
| 11 | 3.3v |
| 12 | -12v |
| 13 | Gnd |
| 14 | Power On |
| 15 | Gnd |
| 16 | Gnd |
| 17 | Gnd |
| 18 | -5v |
| 19 | 5v |
| 20 | 5v |
It pays to be careful with computer power supply voltages, you should check the power diagrams thatare for the computer you are working with. All care should be taken if you are trying to repair a computer power supply and only a registered electrician should attempt any repairs.
Use the above information at your own risk and do check the information for your power supply