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There could be several reasons for the failure of starting the homebrew postgresql, such as:

1. Incorrect installation: If PostgreSQL has not been installed properly, it may not start.

2. Conflicting port: If another application is using the same port as PostgreSQL, it will fail to start.

3. Insufficient permissions: PostgreSQL requires specific permissions to run correctly. If the user does not have sufficient permissions, it may fail to start.

4. Configuration errors: If there are errors in the configuration files, PostgreSQL may fail to start.

5. System issues: System issues such as disk space, memory, or CPU usage can cause PostgreSQL to fail to start.