This is one of the
serious problem that arises because if you set your
monitor with a high resolution with high frequency, then the
monitor doesn't display anything as it's frequency is out of the rang or limit of the
monitor's actual resolution capacity.
Each
monitor will have a limit of max frequency that is said to be the Refresh rate (for each and every resolution setting the display is refreshed.)
When high resolution is set with high frequency that is not supported by the
monitor, it then display a message like "frequency out of range". If you press ESC key within the few seconds of this setting, it will revert back to its initial resolution.
But if you continued with the setting of same High resolution with High frequency, the
monitor is not going to display anything because its frequency is out of the range.
Most of old
monitors like CRT's etc doesn't support 1024×768 at a refresh rate greater than 60Hz.
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