GNOME and external LCD projector

Hello Gnome List

I know this is not totally a GNOME problem but I think some of it
is. Thanks for any help you can give me!

While trying to use my laptop to driver an LCD projector for a
presentation my machine had some problems. I now have a little bomb
icon on my desktop and a core file in the directory I was in when
I started Xwindows and GNOME.


(1)What should I do with this core file?

(2)Can I examine it somehow with the dgb debugger without knowing
  which program caused the problem?

(3)How do I get rid of the bomb icon on the desktop?

(4)The problem all started when I started Xwindows and GNOME (the
  projector was displaying the console text mode screen properly
  before doing "startx") so how do I toggle LCD/CRT mode under
  GNOME (the function key F3 is usually used for this purpose
  but pressing it is what resulted in my having to hit the power
  switch in the first place and produce this core file)?

Thanks again,
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