Question black screen when boot up my pc

[wily wonka]

Hello,

when i bootup my pc there is no input to my monitor. The system is running just no input. I can only reboot by holding the power button.
to start my pc i do this proces until i get input to the monitor, sometimes it works after 2 times and sometimes after 10 times.

spec

• Intel core i5 4690k
• Nvidia GTX 970
• 120GB samsung ssd (only windows 10 installed)

al Drivers ar up to date
checked al connectors

i tried a diff. cable but the 'old' one works
if i switch the cable to my onboard graphics its works aswel

my GPU has power but does not seem to run from time to time

Any suggestions?

Thanks!

 

[Dark Lord of Tech]

Do you have another video cable or port you can test with.