Hi,
The black screen and then return to the login prompt I have seen before and it was caused by not having space left on the users home directory or in /tmp.
I suggest you have a look at your /home/userID and see if you have sufficient space.
Log on as root go to a command line and type in “df –h” and see what space is available. You can also as root go to /home/userID and as it is a new installation there is nothing in there of any importance try deleting it’s contents and then try to log in again
You can also try to create a new user2 and try to login with the new user2 you use created.
To add a new user:
useradd -d /home/newuser –G users –m –p [password] –s
Then logout as root and try login in with the new user.
Good Luck