To switch back to GNOME? without using switchdesk

Hi,
I was using a Redhat linux machine with GNOME environment.
I thought of switching to KDE and i used switchdesk KDE to switch to
KDE.

I just logged off and the screen just went blue screen.
I m unable to do anything with the blank screen.
But, I m able to login to the machine using terminal

My question is
I think I should edit some files (related to X) to switch back to
GNOME.
please let me know which files to be edited and what are the
modifications needed

Thanks in advance
Jothy

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