Cannot login to MySQL (no replies)

Hi experts,

I installed MySQL (Server version: 5.0.91 Source distribution). Started the mysql process and it is running successfully.

However, when I try to login to the database, I'm facing the following issues.

a) Segmentation fault:

[xzy@hostname ~]$ mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 114
Server version: 5.0.91 Source distribution

Segmentation fault

b) Access denied error:

[xzy@hostname ~]$ mysql -u mysql -p
Enter password:
ERROR 1045 (28000): Access denied for user 'mysql'@'localhost' (using password: YES)

[xzy@hostname ~]$ mysql -u test -p
Enter password:
ERROR 1045 (28000): Access denied for user 'test'@'localhost' (using password: YES)

Kindly suggest as to what could be causing these issues.

OS details: Linux xxxxxxxx 2.6.18-194.11.3.el5 #1 SMP Mon Aug 23 15:51:38 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

Thanks in advance for your help.