can not enter gnome session, plese help

["eric" <fsshl@centurytel.net>]

Dear free desktop.org:

  I used debian, and upgrade to xfree86 to 4.2.1 then my gnome session can
not be entered, it work well in 4.0

  how do I know what xfree86 and gnome version right now I install in my
linux system?

  please help,
Sincere Eric
www.linuxspice.com
linux/window pc for sale