My GPU is a Radeon HD 7870, I just wanna mine while I'm sleeping. My electricity is split between 5 people, so usage isn't an issue either, but the gui program is only detecting my CPU (i7). Just wondering if anyone could help me out or point me in the right direction, thanks.

Honestly, it's $1.50. I'm not terribly concerned, it's the principle, stealing is stealing. Anyways, I made a small bet on the Satoshi %50 yesterday, it sat Unconfirmed for a few hours, then I checked it today and there's nothing. Just my outgoing $1.50 transaction sitting in my recent transactions list. Again, it's not a big deal, but you can't just be stealing a dollar from people.