It may save unnecessary effort downloading a fresh copy of Manjaro if you first verify the ISO you have. The checksum (SHA256) file for your chosen edition can be found at the official Manjaro download page:
Basically you have said “I tried this and that but it didn’t work” (paraphrasing). Before we can know exactly what your issue is, more information is needed.
Welcome to the Manjaro community.
As a new or infrequent forum user, please take some time to familiarise yourself with Forum requirements; in particular, the many ways to use the forum to your benefit:
Required Reading:
Resources:
Update Announcements:
The Update Announcements contain update related information and a Known Issues and Solutions section that should generally be checked before posting a request for support.
System Information:
Output of the following command (formatted according to forum requirements) may be useful for those wishing to help:
inxi --admin --verbosity=8 --filter --no-host --width
Be prepared to provide more information and outputs from other commands when asked.
Regards.