T400 Display works at start up but Dark after Windows 7 loads --- Video port works

My T400 display works at BIOS startup but goes black was soon as Windows 7 starts to load.. Video out put works and I can see an UN Backlit image on the display. Is there some sort back light controller /driver that may be broken.
Solved!
Go to Solution.

Sorry, should have been more specific
I don't mean you should switch to Linux, just run it out of a live CD or USB Stick so that we can rule out a hardware failure. If it works in Linux ok for a while, it can mean that you have some sort of software problem.
If your T400 screen goes dark with Linux as well, you may be facing a hardware problem, which could be a defective backlight, a defective inverter (or LED card) or a defective cable.
Can you post here the model type of your T400? It's a 7 digit code that can be found in a black and white sticker at the bottom of the laptop.
/L40SX/240/240X/2*340CSE/360PE/365XD/380D/380E/380XD/380Z/390/560E/560X/2*570/2*600/600E/750Cs/755C/760CD/760EL/760XD/770E/A20p/A22p
A31/i1600/G40/R50p/R61i/S30/SL510/2*T22/4*T4x/11*T6x/6*T4x0x/6*T5x0/3*W5x0/W700/3*X2x/4*X3x/3*X4x/5*X6x/3*X6xT/10*X2xx/2*X200T/4*X30x/Z60m/3*Z61x
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