This is a known fault with r710s but you could try to update your display driver
go to NVIDIA - Download Drivers
Update your nvidia drivers with this link (make sure you're using
Windows 7 32bit) if not go to the nvidia site and let it scan your pc.
After you've done this you should be able to adjust your screen brightness through the windows brightness adjuster.
You are right the back light has failed, check the internet for samsung spare parts and repairs, there should be a few good how to's on how to change the back light, there are some good videos on youtube that will show you how.
It means you need to replace the back light or possibly the inverter.
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