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From where does graphics fail? Right from the start (no boot screen), or later, when the desktop is loaded (X-server)? If the first case, try to change the framebuffer setting. On the boot menu, press F3 to get a small command line and enter vga=0x313 (which is 800x600 resolution). If it still doesn't work, try vga=normal. You should get at least a non-graphical output during boot. To get completely into text-only mode, type additionally 3 at the boot menu. From command line, you could start yast and install the nvidia drivers with online update.
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