try

root (hd0,0)
configfile /boot/grub/grub.conf              or         configfile /etc/grub.conf
boot

it should boot if unable to load the grub  config file or try to manually define the root , vmlinuz and initrd paramaters and boot.

Eg:
root (hd0,1)
        kernel /boot/vmlinuz-2.6.19.1 ro root=LABEL=/ rhgb quiet
        initrd /boot/initrd-2.6.19.1.img


boot






On Mon, 2008-10-27 at 11:49 -0700, MHR wrote: 
On Mon, Oct 27, 2008 at 7:31 AM, fabian dacunha <fabian@baladia.gov.kw> wrote:
> Dear All,
>
> I am quite new to centos
>
> i had installed centos 5.2 to be as a squid proxy server and it was
> working fine for over a month or so
>
> but 3 days back the machine after a reboot jus refused to boot
>
> it jus was goin to the grub prompt
>

Which one?

> i wd really apprecite if someone cd help me ..
>
> cd i boot from centos boot cd n go to rescue mode and check grub
>
Yes, but you probably need to provide more info to get the right answers.

> 2) if grub is OK how cd i reinstall centos without destroying data
>

Let's take it one step at a time.

mhr
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