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I searched a lot about this and ran through all the solution but non of them helped.
My laptop GPU is NVIDIA gt 540m so I tried to install nvidia-legacy-390xx-driver throughout this tutorial by using the official nvidia.com package and again, ran into a "Black screen with blinking underscore" after booting.
By the way Ctrl + Alt + F1 does work but didn't help...
OS: Debian 10
Your card has Nvidia Optimus optimisation and the regular configuration breaks Xorg on your system so you'll have to look at:
https://wiki.debian.org/NVIDIA%20Optimus
to see the best configuration to work around it. I went with "Using NVIDIA GPU as the primary GPU" and it seems to have fixed it. I also put the BusID "PCI:XX:XX:X" from the GPU in the /etc/X11/xorg.conf file under "Section 'Device'". You can get the BusID from from lspci. Hope this helps.
nvidia-prime. But anyways I managed it less than a few days posting this question.