I have an old Dell Optiplex 390 small form factor desktop. I swapped out the motherboard for a new one. The B450M DS3H. How can I connect the current 5 pin to the front panel pins? Is it possible to get a different power switch?
sure you can , ever solder 2 wires and heat shrink tube them after? (during)??? a skill set.
lacking that the connectors are NOT the same nor is there a standard here, ever.
that gigabyte board, has manual that tells you the 2 pin that turn it on, power on and ground
dell does not publish this, (a dark secret)
but my 3020 has 6 pins, pin one is cut, and is the key pin1 (x) 2x3 pin matrix,with 1 pin cut off.(keyed)
456 (if I jumper pin 3 to 6 ground it turns on) old mobo. (not saying 390 is this,but may)
so wire the ground pin above (6) to your GB pin ground, power jack
then wire the 2nd pin called pin 3 power on , to your GP power on pin. and shrink it (means proper insulation)
here is on other person asking same thing, found it in 5sec. search this form.
: Black and Yellow wires. if the old cable has colors some do not. ok?
so I told you : Black and Yellow wires.
and so did speed step.
: Black and Yellow wires.
here is the proof that the newer cable is all black, so colors don't matter,
what matters is pin names. colors are not on this cable, see dell PN there?
I'm sure they saved 50cents going black only, (1/2 joking)
I can tell you what it is.
The wire colors have NOTHING TO DO with voltages.
There are 2 wires for the on / off momentary button.
There are 3 wires going to a Tri color LED.
Careful disassembly of the cable makes this easy to figure out.
I am not however going to encourage this or provide instructions on how to do this. Others have indicated that the red and yellow wires are shorted together through the switch.
Not having ALL wires correct will have "ALERT! FRONT I/O CABLE FAILURE" Orange Black Blue would be the Tri Color LED. Educated guess says that the black wire is the common connection for the CENTER of the tri color LED.