Hi,
start by looking at the X log file. Ie
Code:
less /var/log/Xorg.0.log
You may also find useful output in ~/.xsession-errors or /var/log/user.log
Evo2.
PS. Debian 6 is now "old stable" and support is expected to be dropped on May 4th of this year (1 year after the release of Debian 7), so it is time to think about upgrading.