pavilion zv6000 cpu fan

[JROK]

I have an hp pavilion zv6000 laptop. It has 2 fans. One over the cpu and another general one. I noticed that the cpu fan stopped working a few weeks ago. I bought a new one, installed it and it still is not working properly. When I first boot up my laptop the fan runs momentarily but then stops completely. The other fan works fine (except for a horrible vibrating noise)

Why is this fan not working right?