Dishwasher won't start

Dishwasher would not start. When you pushed the drain/cancel button it would drain. Found no power to fill valve. Ckecked fill valve, (OK) float switch, (OK) door switch, (OK).circuit board fuse, (OK) Replaced control board and things got worse. Still won’t start, I get some (not all) display lights but now no drain /cancel function. Please help!