Monitor displays white screen when connected and powered.
You've done sensible substitutions and it does sound like dead monitor.
The white screen is due to no pixels being controlled at all; what you are seeing is an unpolarized view of the backlight.
It's conceivable that a power supply problem is at fault in the display since it is unusual to lose all control over the screen as this has done.
The cause has to be common to all of the drive circuitry in the monitor and sounds like a job for a tech.
9 months? Is the warranty coverage known?
Unfortunately, warranties seem shorter all the time but it might be worth a shot to locate and email an inquiry to the manufacturer.
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