[求救]mysql启动不了（Red Flag）

我在Red Flag中安装的mysql，安装好后启动不了，手工也启动不了。
我该怎么办啊？望高手指点指点啊！
[root@localhost opt]# rpm -ivh MySQL-server-5.1.7-0.i386.rpm
warning: MySQL-server-5.1.7-0.i386.rpm: V3 DSA signature: NOKEY, key ID 5072e1f5
Preparing...                ########################################### [100%]
   1:MySQL-server           ########################################### [100%]
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost password 'new-password'
See the manual for more instructions.

NOTE:  If you are upgrading from a MySQL <= 3.22.10 you should run
the /usr/bin/mysql_fix_privilege_tables. Otherwise you will not be
able to use the new GRANT command!

Please report any problems with the /usr/bin/mysqlbug script!

The latest information about MySQL is available on the web at
http://www.mysql.com
Support MySQL by buying support/licenses athttps://order.mysql.com
Starting MySQL...................................[失败]

NOKEY, key ID 5072e1f5
Support MySQL by buying support/licenses athttps://order.mysql.com
没有授权文件，你下载的是企业版，需要注册
重新下载一个mysql community server安装就可以不需要注册文件

又出新错了！
[root@localhost opt]# rpm -ivh MySQL-server-community-5.0.41-0.rhel3.i386.rpm
error: MySQL-server-community-5.0.41-0.rhel3.i386.rpm: V3 DSA signature: BAD, key ID 5072e1f5
error: MySQL-server-community-5.0.41-0.rhel3.i386.rpm cannot be installed

怎么回事啊？