Out of frequency means your video card is trying to display a resolution beyond the capability of you monitor. Typically it is really a combination of too high a resolution and too many colors. Typically a 19? CRT will be set to display at a screen resolution of 1024 x 1024 with the color quality at 32 bit or *true* color. Personal preferences differ and you can set it lower or higher, depending on the capabilities of the monitor.
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