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The Power LED of my BeQuite Silent Base 800 is connected with these connectors:
front (notice the little know probably closing the connection):
bottom (notice that the thing on the front that looks like a retention clip isn't one afaik):
There's no way of telling how to disconnect them. Nothing moves or is somehow flexible and the part is so small that I have to pull on the cables after trying to find eventual pressure points - consequently thoughtlessly.
The bottom part is most likely not a retention clip (I'll try to do another photo, but these blurry one are the best out of 20). The connection is certainly retained with the two knobs you can see on the first image.
I think it's very unlikely that the connection is permanent/not supposed to be disconnected by hand, but a producer like BeQuiet that fails to describe how to remove the top cover from the case in the manual, can easily fail at everything.
No idea why a relatively high quality case needs to use those connectors to save two cents and make me think.
1It looks like there is a retention clip on your first picture. Squeeze the retention clip and pull apart. – davidmneedham – 2017-12-20T15:45:08.010
1Maybe the retention clip has to be lifted instead of squeezed, but the blur in the picture doesn't allow to really tell it, but it should be quite guessable in real view what to do to the clip to free the connector. – Tensibai – 2017-12-20T15:49:10.063
@davidmneedham I added images of the bottom which show imo that there's no rentention clip. The connection seems to be hold with the knobs noticable on the front image that I can't get a good image of. – Karl Richter – 2017-12-20T16:39:16.133