When modding Power Cables in to 4 pin Molex connectors most have 3 wires , Yellow , Black and red... Is it nessesary to have the yellow ....I have done some cabling and re wired so that only Black and Yellow is used.... This ok ? Thx
um... Im not so good at electronics..But Im sure on a mod Im doing the front toggle switches to main power I only have red and Black and its powering up fine.. I must check...
Molex have 4 cables. Yellow: 12V Black: Ground Black: Ground Red: 5V I think you're getting confused, and I don't know what a PSU or mobo power switch/button has to do with molexes. Stay away from that kind of thing before you fry something, at least until you really know what you're doing.
AFAIK there's no universal colour-code for the various plugs between case front leds & switches and the mobo headers, but there certainly is for the wires coming out of the power supply.