Hi Harald.
Very briefly, I beleive the CMI software does some rudimentary
hardware checking on boot-up. mptask is, I beleive, midi processor
related, although I've seen this many, many times with a bad channel
card. Try unseating all the channels except for channels 1 and 2 (card
furthest right), and try other channel cards in this slot. If it still
doesn't boot, try a known good CMI-28 MIDI/SMPTE card. Could also be
corrupted software, hard disc problem too...
Hope this is of some help,
regards,
Peter Wielk
Horizontal Productions in sunny Sydney