I just completed my new build the other day and know I'm having trouble with my case fans. The case is a fractal pop air mini and you can find the rest of the build linked below.
https://ca.pcpartpicker.com/list/PXhmQP
When I first finished the build everything looked to be working fine. Then later I came down to find that 2 of the 3 case fans weren't spinning. I have them daisy chained together, so I took off the side of the case to make sure there were still connected. I couldn't find anything wrong with them. So I just happen to touch one and it started spinning again.
Today went I turned it on, the front two didn't start spinning, so I try it again and they started working. So, the clearly have power, but for some reason don't always start spinning. They also don't seem to be moving very much air (I think it was only 300 rpm or so in the bios) but maybe that could be how they are suppose to function.
Does anyone have any idea what could cause this?