Help with CRT display...

Hi all...
I'm facing a nasty problem connecting an external crt display to my MacBook Pro.
First here's the setup:
-Two MacBook Pro 2.4 GHz
-G4 Cube 450MHz
-iBook G3 800MHz
-CRT DPRO750SB 17" (Nec-Mitsubishi)
-CRT AT897D-1 17" (Formac)
-Problem:
I used to connect the DPRO750SB to one MBP with the Apple's DVI/VGA adapter and everything was fine but now the display doesn't light up anymore.
Furthermore, trying to boot with the display hooked up make the computer crash during startup.
-Clues:
The display and its VGA cable seems OK since there is no problem with the G4 Cube (VGA to VGA) nor the iBook (mini-DVI/VGA).
I have no problem using the Formac Display with both MBP (DVI/VGA).
The DPRO750SB icc profile don't show up anymore in the "Displays" Preference Pane.
I'm able to get the DPRO working sometimes by plug the Formac in, unplug it, then plug the DPRO in.
(in this case, the "Displays" Pref Pane says it's the Formac).
I'm really lost now...
Any help would be greatly appreciated...
Thanks
Fabrice

Well BF1942 and 3D mark both run fine, stable, no glitches and run at the size they are supposed to. Does anyone have any suggestions? PLEASE HELP!
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