At first I would clean the card configurations
sudo -i
mv /etc/asound.conf /root/
mv ~/.asoundrc /root/
mv /etc/modprobe.d/alsa-base.conf /root/
and after that add a
/etc/modprobe.d/alsa-base.conf
with this content only:
options snd slots=snd_ice1712
Reboot and then start jackd again, using hw:0.