PLED and FP PWR/SLP LED fun

Got a new case today to replace a very tired and hot one from a time past :P The new case has, for the power light, a negative wire and a positive wire. I first tried putting both terminals into FP PWR/SLP, and in either direction it did not work.
Now with the -ve wire into the GND position on JFP2, and the +ve wire on PLED, the light comes on during VGA initialization, and then goes off when the POST screen appears. It does not later relight. Note however I do not have an operating system installed currently (replacing faulty disk too).
Now this is suspicious, as previously the LED remained lit (old case), even during POST. Annoyingly I can't remember what position I had the wires in otherwise there wouldnt be a problem, however this seems the best bet (putting +ve on GND would be silly as you arent going to get any positive flow from the ground...)
Is this just the BIOS being silly due to lack of an OS, or have I done something wrong?
Board is DKA790GX Plat.
Thanks!

Quote
Have they got information, at the end of the connections?
Yes. White wire has a triangle on the connector (ground), green wire at the opposite end 'third' pin location has no marking. Presume the green to be + positive. This is with both the Lian-Li P7B & PC60B series cases. Since the OP didn't specify what brand case he has, my Power LED case connector may be different than his. I'll try modding the connector on a rig not used as my primary & test it out.
It's really not that big a deal for me since I have a side window, & it is rather obvious if it is powered on or not. Hopefully the OP will be back with info on the case brand & specifics about if it is a 2 pin or 3 pin case connector.

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