If you start your computer and got a blank screen, you need to enable it in bios first. So plug back into GPU the monitor, go into bios and enable onboard video. Then you should get a display.
Now you can mine at the same time without slowing down your computer or mining speed. Only issue you might encounter is the GPU might not work unless a monitor is plugged in. If that is the case then you need a HDMI dummy plug.
A Laptop does not always have a cpu with a gpu.
he may only have the 6700xt gpu
Ahh my bad. I misread this post and didn't realise it was a laptop. I heard 6700xt and assumed it must of been a discrete GPU inside a desktop. And I think you are correct. There won't be any onboard graphics that way.
Even if the CPU has a built in GPU, most likely the mainboard won't have a HDMI connector on the laptop to save space. Because why would anyone want to use onboard video when you got an 6700xt GPU instead.
Basically like the previous poster said above, only way is to lower the intensity and should work.