I disabled the 5570 in device manager, then turned my pc off and replaced the 5570 withe 660ti. When i booted it up i plugged the dvi cable from the monitor into the 660ti which gave no signal to the monitor.
I then booted it up with the dvi attached to the mobo dvi port which works fine. I downloaded the latest drivers but when it installed it said the hardware was not installed.
yeah i had done all that.
Its all working now i changed which port, on the psu, the 12 pin of the pci E cable was plugged into. I have a ax650 im not really sure how it fixed but its all working now so happy days.