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Edit your GRUB configuration: vi /boot/grub2/grub.conf

Find the vmlinuz line for your kernel. Add vga=xxx to the end of the line. For example: vga=792 These are the allowed values:

Colour depth 640x480 800x600 1024x768 1280x1024 1400x1050 1600x1200
8 (256) 769 771 773 775
15 (32K) 784 787 790 793
16 (65K) 785 788 791 794 834 884
24 (16M) 786 789 792 795

Hope it helps.