Unmarked momentary button?

[Boz]

Hi can anyone help me, I have a momentary led power button that I'd like to use with the ATXraspi (2.7). There are 4 pins on the back of the button one is positive, one is negative and the other two have no markings on. I have no multimeter etc so my question is will I break anything if I wire it up wrong?

[Uncle Buzz]

Momentary button + LED = anode - and cathode + for LED (it won't bright if inversed as no current will flow inseide LED) and one contact normally open (most often) so with 2 connections on each side.
The only risk I see is invert contact of button and LED, with voltage than produce too much current in LED.

[Boz]

Thanks for the reply, so the umarked pins are for the button itself...without referring to the install video does these 2 pins have polarity or does it not matter?

[Uncle Buzz]

I guess polarity doesn't matter, standards buttons are not polarised, it's only a contact, no polarity like a simple wire, as lack of marking suggests it

[Boz]

Ok brill thanks for your help 

[Felix]

The 2 pins polarity doesn't matter for the button, so you can hook it any way to the topleft 2 pins of the 4 pin header (up to the current Atxraspi 2.7).
But don't hook that up to anything else or you can destroy the board by causing a short or overload.