Alright. If I get a chance this weekend I'll check for it and advise. Unless someone comes on beforehand.
*EDIT*
Got it done with some bonus pics. What you need is the last one (#5).
Actually found the exact model I think.
Turned out to be one I had chipped some time ago.
This is where the power connector is.
For reference, the middle pin is ground.
But funny enough - it's pins 2 & 3 from the right (in the picture) that are for the power button. You can also see the spots on the resistors/diodes that could be used if you rather solder on top of them.
Hopefully that helps with what you need.