can't boot fresh install

[Frank Murphy (Frankly3D)]

On 08/08/09 21:43, Alan Evans wrote:
--snip--
I booted from the
> install CD and selected rescue mode.
> 
> Rescue mode mounted /dev/sda2 on /mnt/sysimage. I looked and the
> install appears intact.
> 
> I ran fdisk on /dev/sda and it complained, "Device contains neither a
> valid DOS partition table, nor Sun, SGI or OSF disklabel." And then
> further down, "Warning: invalid flag 0x0000 of partition table 4 will
> be corrected by w(rite)." There are no partitions listed when I select
> "p" to do so.
> 
> At this point, I'm petrified. What can be done to fix this and get
> Fedora to boot?
> 
> -Alan

Did you try
when in rescue mode
chroot /mnt/sysimage
grub-install /dev/sda1

and see what happens.