Replaced graphics card and receive no image

Hello there, I recently got my new gtx 1080, which is a replacement for my current 1060.


I switched the graphics card as soon as it arrived. (Without uninstalling previous drivers) 


It worked for a good 3 minutes, then the system suddenly rebooted. After this I can no longer get image from anywhere, not the gtx 1080, not the 1060, and neither my onboard graphics. I get signal because the screen turns on, it just doesnt display anything. My fans are spinning, the leds are on and the card indicates the pcie are installed correctly. (White lights at the pcie slots instead of red ones)


I have tried a different hdmi cable and graphics card slot

Specs:


I5 7600k

Gtx 1060/1080

Psu: cx 650 

Ssd 500 gb 

Hdd 1tb