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Small GRUB screen (menu/splash image)

Hi,

After moving my CentOS 6 installation over to a new PC, the GRUB
start-up screen looks a bit strange. On the old machine, the menu area
and splash image would cover the entire screen, but now they occupy only
a small rectangle in its centre. I think what happens is that the max
resolution of the graphics card/monitor combo is enabled even at this
early stage, but GRUB assumes a 640x480 display.

Is there any way I can change the resolution so that the GRUB screen
covers the entire display? I couldn't find anything related to this in
the documentation, or when searching the web, or actually, the topic is
mentioned a few places, but they all refer to GRUB 2, and CentOS 6 of
course has (a patched version of) 0.97.

Thanks,

- Toralf