Most problem with booting in black screen its a graphic driver issue.
Do you have installed more than one graphic cards in your system? For example one onboard and one dedicated graphic card!
If its so and you use only the dedicated craphic card you can try to disable the onboard in bios.
Also you can try to get into console (TTY) after booting to “black screen”. When you reach your “black screen” press CTRL+ALT+F2. If a login appears you can try to login with “manjaro” as username and pasword.
Saying that something does not work without providing output, or that you don’t want to spend time reading some documentation and only want a solution is not going to take you far, as the community volunteers are not paid workers and the forum is not to be used as a commercial support service. Having said that manjaro has no control over the quality of the answers.