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The laptop starts with a blue screen that slowly fades to black and then i hear the Windows sound. So how could i determine if its the inverter, the panel or the GPU?

So far i tried to connect the laptop to my computer monitor through the VGA port and restarted it, but nothing happened.

Then I tried to boot the laptop in Linux, but there is no way to alter the boot sequence since the screen doesn't work.

I also tried to see the see the desktop in the screen with a strong LED flashlight, but I couldn't see anything; does this mean it is not the inverter?

Any clues? The laptop is a Compal IF-92 with a nVidia GeForce 8600GT

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When you say "nothing happened" (when connecting an external monitor), do you mean you got the exact same problem, or that you got no signal whatsoever on the monitor? If the latter, see if your laptop has a shortcut key for switching to an external display. It's usually one of the F1-F12 keys, and meant to be pressed together with the Fn key. –  Indrek May 24 '12 at 18:22
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On a separate note, the problem most likely lies with your graphics card. The GeForce 8 series (specifically, G84 and G86 families) are infamous for failure due to overheating, which manifests as a variety of display problems. The good news is that you have a couple of options that don't involve getting a new laptop. One option is to bake the GPU (I'm not kidding, I've done it and it works), the other is to replace it. See here for more information. –  Indrek May 24 '12 at 18:31
    
when on an external display i got no signal whatsoever no matter what shortcut keys i tried Fn+F5 on me. so i guess the gpu is fried. i'm about to buy a Radeon HD 3470 i hope it will work. it's on the list on the link you gave me. thank you very much! –  fractal_7 May 29 '12 at 8:41

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