MySQL :: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

I am new to mysql , recently I installed MySQL 5.6.14 on my RHEL5.9 x64 in my vmware workstation.But when I did some exchange to the default database which is 'mysql',something bad happened to me.When I did FLUSH PRIVILEGES on mysql command line,I ...

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