How to change port 3306 if mysql don't work

1. Location file
in my.ini or my.cnf file
change that to some thing else say 3307 n try

or you have to check if any other application is using it
go to CMD and type netstat ,there you will find if 3306 is in use or not
if no application is using 3306 try disabling firewall

2. How to check port
Type netstat -a -n in the command prompt

3. method
1. location file: xampp/mysql/bin (without extention)
2. open notepad n find location, change to all file format type . Find that file n open.
3. Change port number to 3307 or any port available.

This example my file.
# Example MySQL config file for small systems.
#
# This is for a system with little memory (<= 64M) where MySQL is only used
# from time to time and it's important that the mysqld daemon
# doesn't use much resources.
#
# You can copy this file to
# C:/xampp/mysql/bin/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is C:/xampp/mysql/data) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
# password = your_password
port = 3306
socket = mysql

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
basedir="C:/xampp/mysql"
tmpdir="C:/xampp/tmp"
datadir="C:/xampp/mysql/data"

port = 3306
socket = mysql

old-passwords
character-set-server = latin1
collation-server = latin1_general_ci

skip-locking
key_buffer = 16K
max_allowed_packet = 1M
table_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 64K

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (using the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
server-id = 1

# Uncomment the following if you want to log updates
#log-bin=C:/xampp/mysql/data/mysql-bin

# Uncomment the following if you are NOT using BDB tables
skip-bdb

skip-innodb
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = C:/xampp/mysql/data/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = C:/xampp/mysql/data/
#innodb_log_arch_dir = C:/xampp/mysql/data/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#set-variable = innodb_buffer_pool_size=16M
#set-variable = innodb_additional_mem_pool_size=2M
# Set .._log_file_size to 25 % of buffer pool size
#set-variable = innodb_log_file_size=5M
#set-variable = innodb_log_buffer_size=8M
#innodb_flush_log_at_trx_commit=1
#set-variable = innodb_lock_wait_timeout=50

[mysqldump]
quick
max_allowed_packet=16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
key_buffer = 8M
sort_buffer_size = 8M

[myisamchk]
key_buffer = 8M
sort_buffer_size = 8M

[mysqlhotcopy]
interactive-timeout

[WinMySQLadmin]
Server="C:/xampp/mysql/bin/mysqld.exe"
#user=root
#password=