What the heck are these cables and where do they connect?

[Snarfindorf]

My case fans plain don't work, and there are these: http://imgur.com/a/VweFc that aren't connected. I have absolutely no clue where to put them; nothing seems to fit at all.

 

[Someone Somewhere]

The four-pin one needs to connect to your PSU.

 

[scout_03]

the small 2 pins one goes from the fan to fan controller in the case the 4 pins is a molex that goes to the psu check you case user manual how to plug them .

 

[notherdude]

the small one in the image looks like it is for a side door fan