Question Cant get GPU to display and have no motherboard display output

[nexzia]

Completed a new system with my old 1070 as a placeholder until my 3080 arrives. However, I can’t get a display signal from the 1070 to my monitor. HDMI, DP, no matter, neither gets a signal. Having a similar issue on my friend’s system we were able to remedy this by installing his motherboard drivers through the OS by connecting to the mobo display output. After having done so the ‘microsoft basic display adapter’ became a ‘gtx 1070’ in device manager and was able to function as a display output. In my case, the z490 unify has no display outputs so I’m unable to utilise this method.
So, how exactly can I update my motherboard to recognise my GPU without a display output?

 

[rgd1101]

full system spec? include make and model of the psu

 

[nexzia]

full system spec? include make and model of the psu

10700k w/x63 kraken
z490 msi unify
evo 970 plus 1tb
corsair rm850x 2018
gtx 1070 amongst others for display testing
g skill trident z rgb 3600 cl16

27gl850 monitor

i should note that my monitor keeps restarting periodically (every minute or so) when the pc is running, as if it has detected a signal, but then it would go on standby after having received no signal.