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The first thing you should check is that you WiFi is on. What I mean with that is that laptops usually have a button to switch on or off WiFi to generally save battery life. If you are sure that WiFi is on (usually the WiFi button's light is on) than check if ou can see a netwok adapter.
If you dont see it, there can be two reasons. 1. Another program which got installed on the laptop has controll over the WiFi and the WiFi will not be controlled my your Operating system. 2. Check the properties of your network place. It might contain the WiFi adapter disabled. Ceck under the properties and ut the tick poxes on "Show if adapter is connected" and "Show if there is a problem".
Last resort is to check under you Device manager (Right click My computer, Manage, Device Manager) and make sure the WiFi adapter's drivers are proberly installed.
Connect an external monitor to your laptop and boot up the laptop. If you get a steady image on the external monitor then the problem is the backlighting. This could be a faulty inverter that supplies high voltage to the CCFL lamp or a faulty CCFL lamp, most likely thw CCFL lamp is nearly burnt out.
This problem can be repaired.
Go to www.lcdparts.net for parts, repair service and DIY information.