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Try altering your display resolution in all its variables. If the monitor has
a menu, try altering RGB settings, contrast and appearance settings. If this
does not work, most likely a hardware screen failure.
If you have External Monitor check by connecting it if you get
display on external monitor without line it means Display screen is Bad,
if Line appears on external display as well then there is Motherboard problem Please contact Your nearest service centre for Service.
Resolder the power transistors on inverter board and also check them.If display is not there at all some of this 4 transistors C5707 should be defective.Check associated fuse and Fet which drives the transistor.
Also check with Benq ,Normally offers three year warranty.