So I got a macbook A1181 but its screen was all busted up so I bought one from laptopscreen.com/English/ and replaced my screen last night but when I now turn on the laptop The backlight flashes on for a second then goes off, making it extremely hard to see anything on the screen. TO make things works is the screen brightness buttons are not working and there is no brightness sliders under system preferences. My macbook is running OS x 10.4.6