Laptop screens (2) drive me crazy!!!(and I like it...)

My old laptop (nx9420) screen (matte 17') went almost 1/3rd black a couple of months after 3 vertical lines (blue,green,pink) appeared on the left side... I purchased a new one but they sent me a glossy one by mistake...
"O.K" I thought and replaced the screen but the new one is so dark to see...Almost black... I replaced it again with the old one but there's still 1/3 black plus the vertical lines... Finally, When I close and open the glossy screen while the laptop is on I can hear a hiss (white high frequency noise) coming from the bottom of the lcd screen... Not, sure if that noise with a small duration (1-2sec) comes from the inverter or from the back light...
Is the new screen damaged and the old two? Does the new screen need different voltage (the glossy one)? Is the inverter dead? Is it time to throw my laptop of the window?

THANKS!!!