LCD monitors are fragile and not designed to last indefinitely. Signs of an LCD monitor dying can include blinking, a black screen or color-related malfunctions. Hardware problems, such as a failing backlight, will require repair or replacement. Other problems vary in troubleshooting difficulty.
Long Warm-Up Time
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LCDs generally require five to 10 seconds for the image to appear after you press the power button. Older, first-generation LCD monitors may require more time for the backlight to warm up. A process that takes too long may indicate an internal problem that could eventually lead to the LCD dying.
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Dimming
Dimming refers to the monitor not maintaining a consistent brightness. This can eventually evolve into flashing or flickering, which indicates that the problem is worsening. Dimming occurs primarily when the backlight is failing, but can also be the result of insufficient power. Try a different power cable with the monitor to rule out this cause.
Blinking
Blinking or flickering images occur when changing the screen resolution, but can also be a signal of a dying LCD monitor. Although blinking can be caused by monitor burnout, the monitor itself may not necessarily be at fault. Blinking can also arise from bad drivers or a faulty video card. Update your video card driver and verify that the monitor is connected securely.
Fuzziness/Color Saturation
Fuzziness and color saturation are other symptoms that could be caused by a bad video card. Hook up the monitor to a different computer to determine the source of the problem. If your screen is still fuzzy, verify that your operating system settings are correct and that the video card driver is the most recent version. Most monitors come with a calibration/settings tool that allows you to manually configure color settings.