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First , I would visulally check the fans and heat sink fins... see if they are Dusty,clean them if needed... then try booting to an external video source, like a Desktop Monitor.. Connect it to your laptops serial port then press the Function Key and F5..to see if your video card is ok...
Following an advice in this forum I loaded the launch manager for the travelmate 6592, installed it and It put working on the silver P key of the laptop, i.e. the launch manager, and at the same time the fn+F5 key started to working on again. For a long time this key was disappeared from me laptop, just the same time that the fn+F5 key didn`t work.