Bought a new same exact LCD monitor with same serial number from ebay, my old screen wokrs with he inverter board but its just cracked so i decided to buy a new one. the new screen does not work , the back-light of it. Like its really dark. I know the back-light inverter works cause it works with my old screen. And as i mentioned the screens are identical. The person is trying to tell me the inverter is not compatible and hes trying to sell me another one which is the exact same thing as mine. Should i just return the LCD or is there any other thing i might have overlooked. this is for a laptop