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