[Trisquel-users] Frequency out of range issue again

[janeandreas]

I recently recovered an aunt's computer that got an M$ trojan and talked to  
her about Free Software and she agreed to have a dual-boot with Triquel. The  
problem is that after doing the Trisquel install, upon reboot the monitor  
just says "frequency out of range" and the system hangs that way.

I think I need to change the grub resolution, but am not sure how I would do  
that as I can't get into the system at all.

Any idea how I could fix things with the Trisquel Live CD?

Thanks alot.