Belling ID450 slimline integrated dishwasher

Hi folks....would really love some feedback here if somebody has had same issue or can shed any light on situation...I have the belling id450w slimline dishwasher in the house....a while back it just died...wouldn't turn on, fuse/power supply is 100% just no response when pressing on off button on the appliance...I put it down to the printed circuit board in the door failing...(it's not the most top of the range appliance so this could be likely) last night I purchased the exact same model Diswasher second hand...fitted and tested the appliance when I came home and everything was 100%....when I arrive home from work today load the machine and press on...low and behold...no bloody response again!!!! No lights no nothing!!! I find it very hard to believe this is a coincidence so I'm hoping somebody out there has an answer or soulotion or somebody who can resolve this problem! Plz help and thanks!!!!