can't boot fresh install

[Alan Evans]

Just did a fresh install of F11 on a P4. The SATA hard disk was
repatriated from a broken iMac.

I didn't have install disks handy, so I downloaded the netinstall
image and installed the whole thing over my home DSL. This took nearly
a day and a half, and I don't want to repeat that process if I can
avoid it.

I instructed anaconda to remove everything and use the whole drive.
The installer never complained of any trouble. When I went to reboot,
the system refused to recognize the hard drive as bootable. I jacked
around with BIOS settings to no avail. Finally, 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