with parts there no real set life. i had tv go bad in under a year to tv that would not die...on your unit sounds like the backlight went bad. i would google your model see what the cost of the back light is. if it cheap you can try replacing it yourself or pick up a new monitor on black Friday deal. most moniotor and pc will die/faill if there brown outs or power spikes. just had a friend lose there tv from local brown outs we had this week.