[Users] node installation hangs on HP BL685 G1

Hello, trying to configure a node using ovirt-node-iso-2.5.5-0.1.fc17.iso it boots but then at first screen where I should press return key to start installation, actually it seems hung.... I'm installing from virtual cd and it seems I cannot switch to other consoles. Tipically internal disk on this system is seen by Linux as /dev/cciss/c0d0 Tried to keep off "quiet" option from kernel line but no way. The server also has some san disks attached Can I pass any parameter, such as blacklist qla2xxx if san disks could be a problem? Any other parameters I can pass ? Gianluca