problem with gnome2

[Guillaume GOUSSET <gousset@numericable.fr>]

hello

I am under linux debian unstable and have a problem with the start of 
gnome 2 sine my upgrade from gnome 1.4 to gnome 2.

When i start gnome my screen freeze at the gnome start page, and even 
Xfree86 is freezed, however kde 2 start well.

Do you know this problem ?
is ther any solution ?
Sorry my english, i 'm french

ps : im woek on a pc athlon xp 2000+
video card : radeon 7500
500 mo Ram
...

thanks for your help

guillaume
a debian user