I have successfully installed manjaro-gnome-18.0.4-stable-x86_64.
During the installation, I have manually partitioned the system in the following way:
Mount Point: Flag: Size: File System: /boot/efi esp 260 MB FAT32 swap 4096 MB linuxswap / root 472 GB ext4 - Manjaro operating system
The installation is successful. I shut down the laptop. I disconnect the USB. I switch on the computer, and I can see the Manjaro welcome page, with my username: 'david':
I select 'david':
I type the password, and just afterwards I see a black screen: