I've since downclocked my CPU and moved the GPU to the second PCI slot down. I haven't been getting any black screens just yet. Ill update if I manage to get one.
So I've now been through my 2nd graphics card. I've built my own computer recently and I've been having unbelievable problems with each graphics card I've tried to use in it.
The first card I tried was an EVGA gtx 970 4gb with ACX 2.0 (Reference...