First of all, when you are presented with the two options, type in “2” when you select Linux. This will start Linux in text mode.
Next, log in as root and edit the file /etc/X11/XF86Config; this contains all the graphics card settings. Look at the Monitor section, and try to choose settings that better match your monitor. For more information, run the command
(or Google for XF6Config)
You could also try pressing Ctrl+Alt++ (ctrl, alt and plus) to cycle the different graphics modes it's set up; some might work. Also, you can get to a text console after booting using Ctrl+Alt+F1.
Hope that helps,
—Robert J. Lee