xwindows crash - bad graphics card?

[Christopher Mosley]

Hello,
xwindows is crashing,it just occured. I am getting message
something like  xf86OpenConsole: no such file  /dev/tty4
Is it possible the graphics mode on my fairly old card
died - leaving text  mode intact.  Cannot run Xf86Setup 
either.
                                            
                                             Thanks