A bit late to the party but I too have struggled over many years with the connections from the Front Panel on the case to the Header on the Mobo. I have always had Asus mobo's and they always have these tiny connections - currently I have just installed an Asus Prime Z390_A. I too haven't any room for small long-nosed pliers and the "helper block" that came with the board doesn't fit the header! Can you believe that? My case is a Zalman Z-Machine GT-1000 and wouldn't swap it for the world as when the doors are closed the PC runs almost silently.
However may I ask for some help please? Ever since I have had the case (bought in 2008) I have never been able to get the Power Switch LED to work. The Power button, the HDD LED and the Reset button all work perfectly. The header on my board doesn't appear to have changed much over the years, if at all but I am very confused. There are 2 sets of connections for the Power LED (PLED as it's labelled) - 1 x 2 pin header and 1 x 3-1 pin header. So my first question is: why are there 2 sets? Which one do you use or do you use them both? Do they both control the Power LED on the front Panel? Then it comes to the wire colours. I have tried swapping and changing a lot over the years and have decided that the green wire is +ve and the white wire is -ve - is that correct?
If some kind person can shed some light on all this, I'd be very grateful. If needed I can upload screenshots of my board's header and front panel's wires, if that will help.
Thanks