If you add "text" to the boot parameters (the kernel line, F6 in the CD
boot menu), it will not start X. You can then log in on the console and
install the driver like mentioned above. To start X an X session, type
"startx".

I don't think the driver is trying out different modes, it's just the
monitor trying to match the signal from the driver. In principle the X
server will ask the monitor about which modes it accepts, and tell the
driver to use the "best" mode (usually the highest resolution or the one
the monitor designates as "preferred"). If we can get the modedebug
Xorg.0.log, we can see the details of this communication.

But not being able to switch the console might indicate more issues than
just a wrong mode. You see the usplash progress bar until X should
start, right? Try also to remove the "splash" word in the boot
parameters - sometimes usplash interferes with the console modes and
corrupts the screen.

-- 
No signal with Samsung SyncMaster 750s and ProSavage8
https://bugs.launchpad.net/bugs/294899
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