I recently wanted to change my monitor config. Used Sax to select one of the pre-configured settings. Sax rejected my every effort. I got errors about 'mode not supported'. When I selected one that was not in the pre-configured group, it worked just fine. Go figure.
Try this on boot. When grub comes up, add this to the boot prompt (you should see it under the menu of OSs to boot). If not, press the letter e to edit the kernel parameters. Add this to the prompt: vga=791. Its the code for 1280x1024 resolution for 16 bit graphics. If you have your system setup for 24 bit graphics, use vga=792.
If all goes well, you won't see the black screen, and you can use Sax to change the default setting.
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