Blue line at the bottom of my display

My MacBook locked up (I couldn't eject a DVD nor could I turn the machine off) so I had to remove the battery to turn the machine off. When I turned the machine back on (1) the MacBook's display remained dark and (2) my Cinema Display had somehow changed its display resolution to 800x600. I fixed the Cinema Display's resolution easily enough and got the MacBook's display running by changing its resolution to 1280x768 (60 Hz). I don't know what the original MacBook display resolution was, but 1280x768 appears to be it. The problem is that now there is a half-inch wide light blue line running across the bottom of the display.
What should I be doing to get rid of that line?
Any help is appreciated.
Don

The computer appears to have worked out the problem itself. After hitting "Close" and then restarting (as opposed to selecting "Restart"), the display menu came up with "Cinema Display" and "LCD Display" windows set at 1280x800. Everything's back to normal. The puzzling part of this was that prior to shutting off the machine, the display menus were "Cinema Display" and "Display" (not "LCD Display"). I don't know where the "Display" window came from, but now it's gone and things work fine.
Thanks,
Don

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