I have two harddrives in my computer and I took out the older one. I turned on the computer and the fan wouldn't spin at all. So it automatically shut down by itself. Now when I turn on the computer the cpu fan doesn't spin but everything still loads up, windows and everything. But I can't run the computer without the cpu fan on. It's a gigabyte 3d Raptor fan and the speed dial doesn't do anything.If the CPU fan is not working that should be replaced. If it is some other fan, LIKE a hard drive fan, that should be replaced pronto, but it will not kill your CPU.

Please clarify your terms, or post a picture if unsure.,haha sorry I mean the processor fan!Did you ACCIDENTALLY UNPLUG or damage it when you removed the other harddrive? And the CPU fan is the processor fan (CPU-central processing unit). :-/ I don't think so I checked the fan WIRES and most of them looks in place so I don't know whats wrong.!Just to be sure, did you glance at them or did you apply physical force to make sure they are fully in their place?Yeah, I used force, I would get a new fan but it's snowing here and it MIGHT be a few days before I can replace it. I only had it for like 1 year I don't know why it wuold break so fast.All components die eventually. You can either get a new fan or a new CPU, your pick.