Main display simply lost after a sleep

Hi,
Since few days, I have a strange problem with a new macbook (a macbook 5.1, with a GeForce 9400M video card).
From Mac OS (the last up to date version 10.5.6), after a sleep asked from the menu, the monitor simply stopped working, black screen. Even after reboots, I am not able anymore to retrieve the main display.
But it is not an hardware problem with the monitor or the video card I guess,
because :
1/ If I plug an external monitor via the mini display port, that external
monitor works fine.
2/ I have a Linux installed on this computer. The dual boot is supported by
refit, and linux boots by default. When I turn on the computer, during
the refit boot process, the monitor does not work. After few seconds, refit
boots on Linux, and then the LCD monitor works fine just when the grub
boot process is launched !
Just to give more insight about the problem:
- When I plug an external monitor, I can boot on Mac OS from the refit
boot menu.
- Then, using mac os from the external monitor, I see that the main monitor is
not anymore recognized, I can see only the external monitor from the
"monitor preferences". Moreover, from the detailed devices list, for the
"Video Card/monitor" section it is said for the laptop monitor "Status: no display connected" for the NVIDIA (whereas the video card is well recognized).
- It is really strange, but even if the LCD monitor works well on Linux,
the window manager can not find a proper display configuration for the monitor
using the nvidia driver. The latter is thus unloaded and I launch my window
manager in a low-resolution mode with a generic video driver. It became
impossible to load nvidia driver. I do not know if these problems are connected...
I tried several things :
- mac os is completly up to date (I even tried a reinstallation), efi firmware and so on
- resetting the nvram from the mac boot process
- resetting the system management controller (SMC) of the macbook
- from Linux, I recompiled the last official nvidia drivers...
- try to see from an efi shell if it was possible to do something, without success (I am able to launch an efi shell from the external monitor).
- Even if I run Mac OS with the black screen, it boots properly (e.g. I can change from the keyboard the sound volume)
I have no more idea now.
If someone from the list has an idea, or event just an other direction to investigate, thanks a lot in advance.
deffre

Sounds equal to my problem - LCD of my Unibody MacBook stays black since this morning.
My MacBook was working and I went away. When coming back the display was black. No mousemove, shutdown or restart or PRAM/SMC reset helped.
External display works fine. The system recognizes the "internal" display. Backlight is working - so I can set the brightness. But that's all.
I can remember that I had such black drops right after I bought that MacBook (October 15 2008). But after some software updates I never saw this happen again.
I also tried with a totally clean Mac OS X install (have another harddisk) - nothing.

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