If there is no image on display monitor, first ensure that the adjustment for brightness and contrast are properly set.
如果显示器没有图像显示，首先确保正确设置亮度和对比度的调节进行正确的设置。
If there is no image on display monitor, first ensure that the adjustment for brightness and contrast are properly set.
如果显示器没有图像显示，首先确保正确设置亮度和对比度的调节进行正确的设置。
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