Hello

System spec:
Processor: i5 4690k
Mainboard: Asus Maximus VII Ranger (latest bios)
Memory: G.Skill Ripjaws X 8gb
Soundcard: Sound Blaster Z
PSU: Corsair HX750
Single monitor: Samsung BX2431

I was running this setup on my EVGA gtx 670 FTW for a while without any problems.
Lately I bought MSI gtx 970 gaming but I had no signal from DVI. While DVD port was plugged I could load my system (in very low resolution) up to black Win 7 logo, after that there was no signal in either port but from the sound I heard that Win 7 booted. After reset I was able to boot in safe mode I had to RMA that MSI gpu (faulty VRM). I bought Gigabyte gtx 970 G1 gaming and I have the same exact problem. At this time I'm using my old GTX 670 and I have no idea what to do. I've also tried another PCI slot.

Best Regards