White screen....

My laptop has a white screen.... :( This laptop was given to me as the screen is broken & i thought i could repair it. The screen used to come on with narrow vertical coloured lines all the way through it. I've replaced the screen with one that works, only to find that it's not working... Just a completely white screen. Could it be i need a new inverter? I've cleaned & removed/replaced the connections numerous times. The laptop works with a monitor connected to it,.... Any advice would be appreciated. BiLL

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