Modifying grub.conf file in linux

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http://serverfault.com – I edited the 'grub.conf' file of my linux system and changed the 'timeout' value in it and added some other line so as to solve the timeout issue of 'xm console guest' command. I was fool to assume that this 'timeout' parameter in grub.conf is actually related to 'xm console timeout and change it to very large value. So it led me to a big problem. Now when I rebooted my linux machine, it just hangs at boot screen even after manually selecting the Kernel to boot. So basically I want to undo the changes I did in grub.conf file while booting or through grub. Or somehow force the system to boot (HowTos)