[SOLVED] I have a thermaltake core v21 case, I have a problem with the frontal huge fan not spinning while the PC is in use

[Gazzido]

I'm wondering where to plug it in

 

[PC Tailor]

What is your motherboard?
Basically you can plug it into a SYS_FAN header.
Worst case you can plug it into almost any fan header, you just might find it will run at set speeds and you might not be able to modify it.