Monitor Dim (Suspecting software, Not hardware isssue)

Hi,
I have two Toshiba laptops (Qosmio X300, Satellite P100) and they are both giving me the same issue: unusually dim screens. I've tried fn buttons and BIOS settings, but none of that seems to affect the screen.
I've done some research on the subject, and many people when they hear unusually dull screen right away believe that it's a broken backlight, but I'll explain why I do not think that that is the case.
I got the Qosmio about two weeks ago, in came installed with Windows Vista 64 bit.
This was not acceptable for my client so I installed windows XP on it instead.
So the thing I want to mention here is that the screen was bright while in Vista, then it was bright for about a week in XP, now it is suddenly dim, and no software seems to be able to adjust it. (I tried the Nvidia settings, Power settings, Bios Settings, FN keys) The hotkey program by toshiba is installed.
My Satellite P100 is also running Windows XP (sp2 or maybe 3) and with that one the issue is very similar. The screen is dull, it used to be bright and no software seems to be able to affect it.
Here are my serials:
(satellite)
pspa3c-jr500e
(qosmio)
pqx32c-02k01s

Hi
What happens if you would go back to the Vista (preinstalled by Toshiba)?
Did you check if the screen brightness would go back to the normal level?
I think you should do this because its really strange issue
I mean the display brightness could be decreased and increased using the FN+F6 or FN+F7 buttons. The display brightness could change also if you would set another value in the Toshiba Power Saver. But as far as I know there are no Win XP drivers for Qosmio X300 and therefore you could not use the Power Saver for display brightness changing.
But there are XP drivers for Satellite P100 so maybe you would be able to use the FN key combination in order to increase the display brightness.

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