How to recover X display?

[Josef Lowder]

Yesterday at the ASU installfest, I sought help on how to install
VirtualBox on my HP Thinkpad running PCLinuxOS.  After downloading and
installing VirtualBox, upon reboot, PCLinux goes through all the usual
startup steps, and when GRUB displays 4 options: Linux, Linux AFB,
Linux failsafe, and Windows (dual boot), it defaults into the first
Linux option, displays all the usual startup screens, and then the
screen goes blank with a small "-" in the upper left corner, but
nothing else.

I can still boot into Windows, and Linux failsafe, but when I get to
the command line and type 'startx' the same result.  No graphical
display?

How can I get back to where I was before installing VirtualBox (which,
it seems apparent) caused this problem?