Hello all together, I finally managed to hang the system while on console ctrl - alt - F10. Usually (when the system does not hang) the last mesages deal with - shpchp: acpi_shpchprm evaluate BBN fail=0x5 - fglrx tainting kernel (ok, not nice, but boot-hangs also appear when ATI-driver is not installed) - CPU-microcode upgrade: not upgrading to older version - no config for sit0 That's ist - with a regular boot. Now, with the last hang, there was a huge list of information, as far as I rmember it was a dump of the processor registers and a call trace. Last entry in the call trace was: unknown bootoption+0x0/0x1e0 followed by: Kernel panic - not syncing: Fatal exception in interrupt. Does anyone have any idea where I can find this in a /var/log - file? It was a bunch of information and I was not able to write it all down... thanks and regards, Martin