Hi, I'm from Argentina so excuse me if I can not express myself clearly. I have this problem with my GT740. When connect the gpu on the pcie slot and connect the monitor on the mini-hdmi and turn on the pc everything works fine. the problem appears when rebooting the pc after a clean drivers installation I get a black screen after windows 7 logo. I've been trying fix it for a month looking for people who solved this same problem on internet. But i couldn't fix my display problem, so i came here asking for some help. Here below I leave the specifications of my computer and my monitor. Tell me if you need to know anything else.
Motherboard: Asrock N68-VS3 UCC
PSU: LNZ SX Series 550W
GPU: EVGA GT740 SC 2GB ddr3
Monitor: Samsung S23C350
Thanks for your attention. Hope we will solve it because I dont know what else to do.