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Sounds like your screen is physically broken. If your Somebody needs to open
your Blackberry and replace it. If you want somebody else to do
it for you go to Blackberry Repair. If you want to do it yourself, here is an Blackberry 8520 Repair Guide that shows how to repair a Blackberry.
Sounds like you have a broken LCD screen. Go to your carrier, they might replace the phone
for you altogether for free or at a discounted rate. If they refuse,the only way to get it up and running again is to open your
blackberry to physically replace the part. If you want somebody else to do
it for you go to Blackberry Repair. If you want to do it yourself, here is a Blackberry curve Repair Guide that shows how.
There is a Blackberry Repair Guide that shows how to open a Blackberry 8900 Javelin and the storm is very similar. Check for any loose connections inside, otherwise you may need a new screen. Once it is open it's as easy as taking the broken screen off the front assembly and installing a new one, the parts are available on ebay. There are also third party blackberry repair services that will do this for you if you aren't covered under any other warranties.
The Backlight is a separate module actually called "FL Inverter" Its same logic like mobile Fluorescent tube. Most of the service centers keeps in stock as the issue is common regardless of brand. So whole module can be changed. Part is not really costly but workmanship might added on it. If you are able to replace I believe you can purchase the part as well.