From: Michael Klinosky <mpk2 at enter.net>
> I installed CentOS 5.3 on a desktop box, and I'm having a problem with
> the splash screen resolution (during bootup).
Try to add vga=XXX at the end of the grub kernel line...
http://www.linuxquestions.org/blog/archtoad6-147095/2007/12/29/vga-resolution-codes-for-grub-andamp-lilo-830/
JD