To cut a long story short... 
Pc doesnt boot, I get a '2A' error on the motherboard which is graphics card related and a t_fault light is lit on the graphics card.
I had the motherboard replaced and the problem still occurs.
I tried my graphics card in a friends pc and his pc booted into windows. I tried his card in my system but my system would not boot.
I tired my PSU in his system but had to use the 4pin atx connector to the motherboard not the 8pin which I need to connect to mine. It booted to windows but the case speaker was beeping non stop, which we found to be PSU related.
Is it wise of me to think that this is down to the PSU? It powers everything else fine as far as I know. Case lights, fans, cpu fan, but it seems that when the 8pin atx connector is in use, it does not like to power the pci-e connector at all.

Pc doesnt boot, I get a '2A' error on the motherboard which is graphics card related and a t_fault light is lit on the graphics card.
I had the motherboard replaced and the problem still occurs.
I tried my graphics card in a friends pc and his pc booted into windows. I tried his card in my system but my system would not boot.
I tired my PSU in his system but had to use the 4pin atx connector to the motherboard not the 8pin which I need to connect to mine. It booted to windows but the case speaker was beeping non stop, which we found to be PSU related.
Is it wise of me to think that this is down to the PSU? It powers everything else fine as far as I know. Case lights, fans, cpu fan, but it seems that when the 8pin atx connector is in use, it does not like to power the pci-e connector at all.