Hi all, I have a Asus M3N-HT Deluxe motherboard and a Zotak GTX 260 graphics card and all of a sudden my screen wont display, I can hear my pc boot up the fans are spinning on my graphics card and if i use the onboard graphics through vga cable i can see my screen, however if i use the black or the blue pci slot on my motherboard my graphics card is running and fans are spinning but it wont work, also I have tried another working graphics card from my other pc and put it in mine but same issue it does not display anything on the screen ,the second graphics card i can confirm is working but cant with the zotak as its too big for any of my other cases to test on, to clarify it has worked before ive had it with the same set up for 1 year and not issues, I have changed anything I was using it the night before switched it off booted it in the morning and can no longer see anything on screen, any ideas why my pci grapics slots are not working?