Cannot start a cluster

Hello,
Thank you for reading my post.

I am a novice PostgreSQL user.
---- OS: Windows 8.1 Pro
---- PostgreSQL: 9.4.1
---- Commands are issued in command line in "cmd.exe" ran as user
"postgres".

Some time ago, I created a cluster "my_cluster_1" with a database inside
"my_db_1".
Today, when I try to start the cluster, here is what happens:
==============================================================================
windows_cmd.exe_ran_as_user_postgres> pg_ctl start -o "-p 5449" -D
my_cluster_1
server starting

windows_cmd.exe_ran_as_user_postgres> psql -p 5449
psql: could not connect to server: Connection refused (0x0000274D/10061)
        Is the server running on host "localhost" (::1) and accepting
        TCP/IP connections on port 5449?
could not connect to server: Connection refused (0x0000274D/10061)
        Is the server running on host "localhost" (127.0.0.1) and accepting
        TCP/IP connections on port 5449?
==============================================================================

Question 1: How can I investigate what the problem is? Is there a log file
somewhere?
Question 2: Given the messages above, can you see what's wrong and how to
fix the problem?

Note that I do not experience this problem with another cluster that I have:
==============================================================================
windows_cmd.exe_ran_as_user_postgres> pg_ctl start -o "-p 5450" -D
my_cluster_2
server starting
LOG:  database system was shut down at 2015-11-25 10:29:17 CET
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started

windows_cmd.exe_ran_as_user_postgres> psql -p 5450
psql (9.4.1)
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
Type "help" for help.

postgres=# \c my_db_2
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
You are now connected to database "my_db_2" as user "postgres".
my_db_2=#
==============================================================================

Thank you for helping.
Best regards.





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