hi.

I have an Asus A7N8X mobo and i am using speed fan but i cannot seem to control the fan at the rear of my case. It IS plugged into my mobo and i do have Q-Fan technology.

Does anybody know of a way to control that fan?

Hi claygorman,

If you can't control it via software, you could always try controlling it using a fan controller. They are quite cheap:
Fan Controllers, Fan Grills, and Accessories - CrazyPC