EDIT: heh.. pump sata power connector disconneted

but now there is another problem:
lots of hash core error (they were also here before that power came loose).. what is the cure for that?
Lol yes - pump disconnected will do bad things.
Are you allowing cgminer to squelch cores? It's the same core giving you errors.
I see squelching in cgminer logs (at least for other boards), so I guess it is allowed.. It's always die 0 but different cores..