More information is available at the community portal. You may ask questions at the help desk, village pump or on IRC channel #wikimedia-commons (webchat). You can also contact an administrator on their talk page. If you have a specific copyright question, ask at the copyright village pump.
Error in File:ATX PS signals.svg
The 4-pin P4 section on the bottom has the square and chamfered pins reversed, if you are indeed looking at the bottom of the plug, rather than the connector on the motherboard. Which is the convention adopted by the 24-pin connector on top. Ref: Fig. 8 on p. 20 of ATX Specification, Version 2.2 220.127.116.11 12:35, 14 March 2013 (UTC)