They run fairly quietly and push a decent amount of air, but I can't get them to light up!

I originally bought these to put into my brother's new build, since he loves purple. The problem is that I can't get any of the fans to light up, regardless of which connector (these have both 3-pin and molex options) I use. The LED fans that originally came with the case (not purple, sadly) work just fine when plugged into the mobo, so you'd think it'd have to be these fans that are causing the problem. The fact that they're so inexpensive and work well as fans means that I'll keep them for myself, in case I ever need a decent fan in a pinch/put together a cheap build at some point, but I wouldn't buy them in the future.

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