For the monitor that is more than 2 years old, first place to look will be the power supply, look for bad caps with bulging top first, post back what you see inside so we can guide you further, see example of failed monitors due to bad caps; http://s807.photobucket.com/home/budm/allalbums
Sudden Shutdown of the unit, I Cannot use my FP72E BenQ LCD monitor Properly because at the middle of using it, it suddenly shutdown, open, shutdown again, open again. is this unit is capable for long hour of use?
Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Replacement board: http://www.lcdrepair.us
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