Fedup 17->18 won't boot, all partitions are GPT

[Rick Walker]

Hi,

I did a fedup from F17 to F18 on my work desktop.  Now I get an infinite
boot loop.  Fdisk can't look at the partition table of /dev/sda because
it has been coverted to GPT format (who did that?). 

As near as I can tell, the boot process fails after about 1 page of
output near where "/" should be mounted.  I can't see the error message
because it reboots too quickly. 

Doing a rescue with an F17 bootable flash drive allows me to at least
mount my /boot and / partitions, so I guess F17 understands the GPT
conversion.  It won't however, recognize the new system to do a boot
sector repair.  Should I try with an F18 bootable flash drive? 

Under the F17 debug prompt /dev/sda2 (boot) and /dev/sda4 (root)
both give clean fsck checks.

I appreciate any suggestions.

kind regards,
--
Rick Walker