I am having problems with GNOME. 2 days ago on my Debian Linux I have installed Steam, with about 50 packages with it. Some of them were xorg drivers. I have already had problems with it, but didn't expect it will happen this time. Once I have installed it, I have rebooted my laptop, and I was really dissapointed when I saw an a console login screen. After logon, I have tried to uninstall Steam and 'apt-get install gnome'. I have downloaded about 1 GB of packages and it still didn't work, at all, now I had the missing dependencies errors, that I can't fix.
update: forgot to mention I use AMD64 Linux, some error pictures: