I have an AMD Radeon R9 270X gpu and I plugged it into an old pc. The gpu has 2 ports on top to add pci express, I added one from my old pc power supply and the fan was spinning but no image on screen. I tried a lot of ways trust me. Could the problem be that I didn't have two pci express cords plugged into the gpu? DO I have to get a semi modular or modular system? I want to get this exact PSU: Power Man Active V2.2 450W power supply. But it only has one pci express connector. Can it work? Or was my old pc just old? Why was there no input on my monitors? I tried both and every cord (hdmi,vga and dvi). I have built a working PC before. Never dealt with pci though.