You have to be careful when doing this, A few times I have come a cross the case of somone buying a new lcd screen for a laptop trying to replace it only to find it does not display a picture. the main reason is down to the inverter board that powers the back light of the screen is not correct. If the laptop powers up but no picture is displayed and you can hear the windows boot up sound. and have checked the video ribbon is connected correctly to the board of the laptop to the new screen it it will be the case of the inverter at fault. You did connect the leads to the inverter for the back light right ?