After all that, it's the 290X! Sounds like something has overheated/started to die. Teenwolf was right.
still doesn't explain a lot of things mainly why a more powerful psu its getting it to work and a lot of other things too, gonna keep the new psu and hopefully bag a 390x in all this sale madness.
On another note spoke to supplier and they have raised an RMA the old one gets collected tomorrow.
Its got a two year warranty whats even better warranty expires 28/11/15

hopefully they pay me out as they said they will refund me and as its no longer available