I recently purchased a EVGA GTX 660 Ti, but misread the number of pins needed and was one short. So I bought a new power supply because Ive been needing a new one for a while. I took out my old AMD 7450 and installed the 660 but i just got a blank screen. I thought I must have forgotten to uninstall the old driver so I put the AMD back in. When I did this the rear fan and CPU heatsink fan started to spin at full throttle. Ive cleaned out all dust and grime and all the capacitors seem to be ok. I have no idea what is going on. Please help!
make sure you plugged back in the 4/8 pin connector on the mb. with the new power supply make sure you used the right cables. the video power cables on new power supply are 6 pins with two pin hanging..there called 6+2 connectors. most mb pci power connector are two 4 pin cables or one large 8 pin cable.