[SunHELP] Urgent !! Help , Can Login on SUN OS 5.7

[Prashant Desai]

Hi 

   i am running Sun os 5.7 , it was working great till
now , but since last 2 days i am facing wiered
problem,

i am not able to "su -" to the system , i can telnet
on the system and login with normal uid , but when i
gives "su -" it asks for password , and then just gets
hang no responce at all , even i tried going to the
terminal and tried to open the console/terminal window
locally on the mechine but that also is not working 

can some one tell me what could be the reason for this
and how can i restore it back to normal state 


pls reply asap
as m really in big problem as m still learning solaris
and new to it 

regards
Prashant
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