Fedora Installation :: F13 "Tried To Mount Image #1?

I have installed numerous Linuxes and Fedoras. This is the 3rd F13 install - other 2 were no problem! This one has me stumped. I have tried dvd install, boot.iso on usbkey, netinstall on usb and dvd. This problem crops up each time! I always manage to get the disks reformated and partitioned but no further. If I go to screen F2, everything seems to check ok - the usb is mounted and visible. The partitions are mounted under sysimage, a loop device is mounted under runtime (cant determine what though).

All the boots result in "Select Partition" - looking for install.img. With dvd does not list dvd drive as an option. With usb - firstly search sda1 (no usb option appears initially), fails then show the usb drive! and it finds the install img! All strange. Logs all show that all devices are recognized and mounted (or mountable) and viewable. sysimages are all writable! (can copy files between etc )..

Anaconda last message was "transferring install image to install target". What is transferred and where should it be? What needs to be mounted can it be done manually from screenF2?? Is it possible to get more info out of anaconda?? Is there some way of bypassing that "tried " message as the only way out is a reboot!! I am getting desperate - I need this machine working for a field job very soon.