Hanging after Hibernating and Suspending

[Ken G.]

After typing in my password after using the Hibernate or Suspend mode,
the computer take its time checking the password and seems to hang or
looping forever.  I have to resort to turning off the power to the 
computer. 

It works several weeks ago before but now, it does not.  What am I
missing?

I am using a dual boot grub, having Windows XP in the first partition
and Ubuntu 9.04 in the second partition.

Thanks,

Ken