Is there such thing as a 5 pin power switch to 2 pin adapter?

The front panel power button has 5 wires.

2 of the wires YELLOW and RED are the switch and 3 of the wires are Tri Color LED

Dell does not document this nor do they support changing to standard case. 390 and 3010 use same parts.

https://www.amazon.com/XtremeAmazing-Optiplex-Switch-074XPK-74XPK/dp/B01MTQRE7J

Power Button

Optiplex 390 3010 MT Power Switch Button Cable 074XPK 74XPK

74XPK

Speedstep ~ "You ARE the Guy" and "Thumbs UP" for great work!...  Yours is a very detailed and wonderful reply! 

Thanks to you, we now know the Switch color code: "YELLOW and RED are "the switch"... That info saves a LOT of work!...

But I must confess, the total process and all of the steps outlined (so well) to repair *everything* seems so time consuming and demanding?

I suspect both the 2 and 5  wire switches are a typical DELL "Momentary ON" switches and are not "Latching ON/OFF" (like a wall light switch). The switch 'springs right back' and one does not feel a tiny 'snap' as we press? 

***So as long as your 2 wire switch "satisfies" that 'momentary' YELLOW+RED connection, YOU should be good to go!***  A ohm meter will quickly tell you if your new switch is momentary too...

IF your 2 pin 'switch'  mechanically "fits" (and I have to assume it does), why WORRY about LED's because switch LED's are not mandatory!  In every other respect your system should power-up ~ or it won't because of a different failure. 

But of course your Switch could blow again if there is a problem in your supply and too much voltage is (possibly) fed to the switch>?

Also one still has the Power Supply LED's for diagnostic help, plus the display for status help as well...

ME?  IF my 2-wire switch was the "latching" type,  I would STILL use it to "power-up" ~ then quickly (and manually) press it again as soon as the system started to boot!  And why not?  The System and power supply are 'satisfied' with a "momentary switch condition" and the System boots!

IF one needs a 'hard power down' ~ where the system was OK, but suddenly 'locks-up'?... One could STILL use that 2 wire power switch to do so ~ latching or not.

And honestly... I never pause to see what LED is flashing at my power switch?... I just don't.  I PUSH the button, my DELL STARTS (I automatically listen for 'fan action').. I buckle my seat belt and GO!

Anthony

as speedstep said the colors are not a standard, If you buy 10 switch cables, used you see that, there are 2 or 3 color types. some are even ribbon cables (oddly) so speedstep got that right,

if you power it on, with no LED< you get BIOS post errors  for just, missing LED, that and runs

dell monitors (for plug fell off) all mandatory jacks , this and front panel are 2, such jacks.

only momentary switches (normal, open) work , ( latched switches are never used here ever. )

we have posted this topic here many times, no need to really ,do it 10 times more.but sure. seems popular and fun/?

on mine pin 3 and 6 are power on.

pin 1 is cut key,  1, 2 3

-----------------------4,5,6

to test that just  using  jumper wire, and  small screwdriver tip and jump 3 to 6 for 1 instant, bam its on.

all techs, now how to do this , but the pins are not industry standard pinout. no PC is.(make or models.)

This is SO WRONG