Tecra R840-111: external monitor continuosly restarts

Hi all!
I have some problem when using the vga of the Tecra R840-111 with my external monitor/tv (LG M237WDP).
The monitor continuosly restarts (it seems like to reboot).
This behaviour doesn't happen with another external monitor or if I use another laptop with the monitor named above.
I have used a linux live CD (ubuntu) and everything's ok. Isn't it weird?
Hints?
Does my toshiba have some kind of diagnostic menu hidden in the bios?
I know that some laptop requires the user to hit i.e. CTRL+V in the bios in order to enter that diagnostic menu. Is there anything like that?
Can you help me?
Thank you.
Marco.

Hi
Ive got exactly the same external monitor but I didnt notice any monitor issues like you have described in the message.
Ive got two notebooks and the monitor is connected using VGA cable and DVI cable to both notebooks
In both cases the monitor does not restartso Im not quite sure what you are talking about
Regarding the BIOS.
Its not know to me about any hidden menus in BIOS.
Furthermore you said that this issue does not appear using Linux so I would say its definitely nothing wrong with BIOS. Also this theory would be confirmed because the other external monitor works ok.
Maybe some kind of software preinstalled in Windows OS cause this??
Additionally in BIOS you can choose the option detection of external monitor (or something similar). Usually its set to automatic but I set this to internal display.

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Message was edited by: shaneh20
Message was edited by: shaneh20

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<img src='http://img84.imageshack.us/img84/4374/advpr.jpg' border='0'/>
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