Let's start with getting through grub:
find /boot/grub/grub.conf
or
find /grub/grub.conf
Try both, whichever gets you the results. It should return something like (hd0,1) or any other numbers.
Next, use that partition:
root (hd0,1)
(or some other numbers, which you got from the find command)
Next load kernel.
kernel /vmlinuz (as you write this far, just press TAB once or twice and it will give you the kernels availablem, if any then it is ok, just choose one, you probably have just one.)
The complete line for kernel loading should be:
kernel /vmlinuz-2.X.x-x.x ro root=LABEL=/
(find and put in your kernel name with TAB, remember)
Next all you have to do is choose the initrd file:
initrd /initrd (again press TAB once or twice and it will autocomplete the initrd name)
In the end you should have a :
initrd /initrd-2.X.x.x.img
And finally:
boot
You should be in your RH by now
Happy and smiling.