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Could be a dead screen, use your vga, hdmi or svideo port to an external monitor or tv, if you get video there, then your laptop is still working and it is your screen. Check to see if you see any pictures on your screen but it would show in really really dark picture... if that is the case it is your screen backlit bulb that gone bad and the screen will need to be replaced. If nothing appears on your screen but you get picture to a external monitor via s-video, hdmi or the vga port then it could be that you have a loose cable connection or bad wireing somewhere between your latop base and the screen. If nothing at all appears on your screen or the external monitor source then you have a promblem with your laptop.... and those promblem can be in a wide range of trying to seek out the defective part.
Sounds like either the backlamp has gone out or the inverter is bad, or both. Try connecting your laptop to an external monitor (desktop type) via the avi output in the rear of your machine. If you get the video on the external monitor chances are one of the two things I mentioned previously are to blame. You can repair this yourself if you have some expertise, and your not feint of heart. Heres a link (although not specific to your particular model), but it does give you an idea what your in for.
When you start your computer, keep hitting the F8 key. you will get a menu that comes up.. Choose the VGA mode.. this will stop the computer from loading video drivers and will allow you to install the new monitor.
Give that a try.. Hope it helps... let me know
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.