Manjaro doesn't boot after I install Nvidia drivers via "sudo mhwd -a pci nonfree 0300"

[brahma]

that can be fixed:
kate /etc/default/grub
and change this line to look like this:
GRUB_TIMEOUT_STYLE=menu
then save the file and run this:
sudo update-grub
reboot and check

and then post output from:
inxi -xG

[Sadik]

Graphics:
  Device-1: NVIDIA GP108M [GeForce MX230] vendor: ASUSTeK driver: nvidia
    v: 525.60.11 arch: Pascal bus-ID: 01:00.0
  Device-2: AMD Picasso/Raven 2 [Radeon Vega Series / Radeon Mobile Series]
    vendor: ASUSTeK driver: amdgpu v: kernel arch: GCN-5 bus-ID: 04:00.0
    temp: 60.0 C
  Device-3: IMC Networks USB2.0 VGA UVC WebCam type: USB driver: uvcvideo
    bus-ID: 3-2.2:5
  Display: x11 server: X.Org v: 21.1.6 driver: X: loaded: amdgpu,nvidia
    unloaded: modesetting,nouveau dri: radeonsi gpu: amdgpu
    resolution: 1920x1080~60Hz
  API: OpenGL v: 4.6 Mesa 22.3.1 renderer: AMD Radeon Vega 8 Graphics
    (raven LLVM 14.0.6 DRM 3.49 6.1.1-1-MANJARO) direct render: Yes 

[brahma]

@Sadik

driver: nvidia

so the driver is loaded, and problem solved

[Sadik]

Thanks a lot sir. This was such a huge help. but could you tell me one more thing? Suppose in the future I somehow needed to reinstall manjaro. How would I fix this issue then? just by editing that module line?

[brahma]

did you edited the grub, reboot and is the grub menu now being shown?
yes you can install with open source drivers, and then in your installation you edit the modules section, and install the proprietary drivers, reboot, or you can do it from chroot, like described above

[Sadik]

Yes grub is working now. Thanks a lot man. I was so troubled for the last two days. Thanks a lot sir <3

[brahma]

i again forgot that you are on amd+nvidia and not on intel , so edit the modules section and replace the i915 with amdgpu:
kate /etc/mkinitcpio.conf

MODULES=(amdgpu nvidia nvidia_drm nvidia_uvm nvidia_modeset)

save it, and update it:
sudo mkinitcpio -P
reboot