Its a bit of a long story. I have a Dell PC that I purchased last year. I recently purchased a gtx 1070 and it would not fit in my Dell midsize tower, so I bought a new case (thermaltake h22 plus), a new PSU (thermaltake 600w), and then I moved my motherboard (Dell H81 mini-ATX) to my new case. Mobo is installed properly, I got stuck for a bit connecting the front panel power buttons and led lights to the really badly designed LEDH1 connectors (completely unlabeled), but after a little trial and error, the system powers on and the LED lights are working properly.
This is where I get stuck. Even though the system has power, I cannot get a video signal on anything I've tried. I have two working monitors, an Acer 25'' IPS 1440p and a old dell 4:3 LED monitor. I tried the HDMI and VGA slot for the mobo's onboard video, no signal on either monitor. I switched in my GTX 750 ti that worked flawlessly with my Acer monitor and the H81 mobo in my original setup. No signal from HDMI or DVI-D which worked previously. I switched in the GTX 1070. No signal from the HDMI or DVI-D cable. The fans are working on both cards and the LED lights are showing power to the GTX 1070, so I dont get what's going on. The mobo isn't making any funny sounds, it is booting up without failure and the fans are silent and cool. I can't imagine I installed anything improperly.
My computer is running Windows 10 (free upgrade edition), my primary drive is a crucial SSD, with a backup HDD that came with the system). 16GB of ram. All the components are the same that worked perfectly before I switched the mobo over.