F19 does not boot: how to debug SHIM

[Robert M. Albrecht]

Hi,

I installed F19 on my Linux machine, running several Fedora-releases
without problems.

But F19 does not boot at all. Installation (USB, Live-CD, Install-DVD
and pxe all tried) produces no error messages or warnings. At least I
can't find them.

The system reboots after installation and nothing happens. BIOS passes
and Grub should show up but, but doesn't. Switching on/off UEFI does not 
seem to have any effect.

Of course SHIM comes into mind. But how to debug Shim ? Any magic keys
to produce a log or something similar ?

Can F19 be installed without SHIM ?

cu romal