Grub2 uefi Missing Operating System

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http://forums.fedoraforum.org – OK, I've wasted the weekend trying to do this and I'm stumped. I got a Z210 (UEFI) that came with Win7 pro preinstalled. I wiped it and put on F17. Easy. My new job involves windows so I have to reluctantly dual boot. I did a clean wipe of the drive (GPT) and installed Win7 in a ~50GB partition (GPT3). It also created what it needed for efi (GPT1) and some other hidden partition. All good. Now I install F17, remembering to install the bootloader (grub2) onto /dev/sda5 (/ .. GPT5) rather than the default /dev/sda. When I reboot, I get a nice clean message "Missing operati (HowTos)