you mean the DT, external power-button JACK wiring , pinout right?

it is a dell secret only dell has that jack and is LOST.

dell lost the Document pages on that dell only jack, (rare this jack in any PC)

Hi

Thanks.

I thought this could be controlled with a remote control.

What that mean? See the picture

LOST

it is lost

but what do you need it for, ? my guess is mounting a PC in box (with air filters for saw mill) or for KIOSK use?

Hi

Thanks for the answers. I'll try to put the picture back.

ahhhhh that jack

seems lost in the sands of time , not shown in the dell books, dell.com nor google finds it ,nor does manualsdir.com find it,  lost..

found 3 old dell books for XE , no docs on the  secret dell only jack.

using reverse logic XE3 back the named doc file might be.

OptiPlex XE desktop Remote Power Switch Installation Guide

OPTIPLEX XE2 POWER BUTTON CABLE  030WGC

https://www.dell.com/downloads/global/products/optix/en/optiplex-xe-tech-guide.pdf

https://www.dell.com/learn/us/en/rc1281555/videos~en/documents~esupport-optiplex-390-sff-power-switch-cable-en.aspx

OPTIPLEX  POWER BUTTON CABLE 030WGC

I can tell you what it is.

The wire colors have NOTHING TO DO with voltages.POWER BUTTON WIRES

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.

if you only told why ,

we can tell you how to cut  one wire, and make your own JACK

pin1,  power on.

pin2 ground,

and a simple , N.O (means normally open) momentary SPST switch of any kind.