Thanks for replys guys. I changed the PCI-e, didn't make any difference. The new one woudn't work in the old spot in the MB. I put the new one in a different slot in the MB and it started working but very poorly, doing about 100 sols only out of 700 which is usual.  After that I put back the old PCI-e that I tought it was bad and it worked in a different slot in the MB.

It seems that one of the slots pci slots from the biostar tb250 died, very weird.

Now it's back and running in normal parameters with the old PCI-E!