I recently started to build a new computer. Everything seems to work fine, but one thing that scares me is that during testing the system out, my fan didn't start up a few times. This fan is just right out of the box and came with the Intel i7 3770K CPU. 

Since then I haven't had any problems, but my concern is that one day down the road my fan wont start and all of a sudden I have a busted CPU due to overheating. There a few possibilities that have come to my mind regarding why the fan didn't work:

1. In the beginning, the wires to the motherboard were interfering with the fan. I fixed that and then it only failed once after (Potentially because of the same problem).
2. The fan works fine and I am an idiot (highly likely).
3. The fan is a dud and I replacing it would fix the problem.

I'm not exactly sure which one of these problems could be affecting the fan.
On a final note, there are a couple things I have considered to rectify the problem.

1. Return the fan.
2. Get a third party fan.

I'm just trying to figure out whether this is a problem that I should really consider getting fixed, or whether I should assume its all good and I don't have to worry. I have downloaded a temperature monitoring application to alert me whenever the CPU gets above 45 degrees (its at around 28 right now). So far, no problems.