crazy color screen after boot

[Sam Folk-Williams]

Hi,

Just installed Ubuntu and this funny thing happens. After the system
boots up, but before the log-in screen appears, the screen turns into
this crazy mess of colors, flashing green and yellow. Looks like X is
trying to start but failing. If I hit ctrl-alt-backspace to close X,
it restarts just fine with the normal ubuntu log-in screen... I assume
there must be some messed up configuration... This happens every time
I boot and the fix is always the same, too. Any idea what files I
should look at? Anyone else having this issue?

Thanks,

Sam