Inspiron 5680 5675 power switch pinout

The two models use same DP/N for power button cable

user report:

Dell uses their own nonstandard Mobo design:

The connector pins look like this:

x 4 5

1 2 3

And they mean this:

1 is LED +

4 is LED -

2 and 3 you must bridge permanently

connect (2+3) and 5 are the power + & - 

another user：

I can confirm that the power switch can be replaced by combining the 2 & 3 pins then connecting them to the standard case switch with the number 5 pin. The LED + and - are correct too. 

https://www.dell.com/community/en/conversations/inspiron-desktops/inspiron-5675-power-cable-error-message/647f784df4ccf8a8de6620a7