Ubuntu 13.04 Login Loop

I have a problem with Ubuntu 13.04.

I cannot log in to my account. I put the right password but there is an endless loop. (if i put wrong pass, it says "Invalid password..."). Also, it doesnt show the small drop down menu with choices "Gnome fallback, Default, etc.."

If i login as guest, the desktop is clear, no bars, no menus, anything. Just right clicks works only.

I have already try this solution ( chown username:username .Xauthority ) but there is no "Xauthority" at ubuntu 13.04. (?)

Is the problem about lightdm?
Also, i tried sudo dpkg-reconfigure lightdm but it soesn't work.

I use the recovery mode (root command shell or something like this) in order to try the above commands.

Has anyone a solution?

Thank you.

Try deleting $HOME/.profile, I had the same problem before, because I added a function into $HOME/.profile.

When I deleted the function, I could login again.
The original content of $HOME/.profile is

# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.
# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022
# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
    . "$HOME/.bashrc"
    fi
fi
# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
fi