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Squish it!

I remember when I actually had a bug in my LCD display. I couldn't squish it (I tried to in a corner - really not very wise) but it was behind the LCD layer (duh). So I unplugged the display, put it so the vents (this was the old plastic 23" Cinema) were facing down, shone a flashlight in there so the ant would be drawn to the vents, and let it sit for a day.

When I turned it back on, the ant was gone. Thankfully. The thing was going everywhere on my display when it was there.