Thanks guys for the help
soest009 the PSU seems ok as when I reinstalled the same happened.
Dav thanks man, don't know why but in the process of changing the PSU I lost stuff, my OC BIOS settings and it seems also driver support for the GPU, why I have no idea.
Spent about two hours with a black screen after every non safe reboot but got there.
This is my first PC build so its all fun learning new stuff.