Cant Login after installing Fedora, screen keeps flickering

[Mehul]

Hello,

I installed Fedora on my Tohisba A70 Laptop yesterday and I am not
able to get into it. The installation worked fine, but when I try to
boot into fedora I can c a dialog box which has a text say "show
details", just after that my screen starts fickering. I am guessing
that this issue is realted to my Graphics card.  How do I install the
the new driver coz I cant even get to the command prompt?

Can somebody please tell me how to get into command prompt while
booting fedora?.  I mean is there a set of key sequences which would
directly get me into command prompt

Please help

Mehul