Mdbh950aws not working

Lights on dishwasher control panel stopped working, dishwasher will not turn on. Changed door switches, which test good. Then changed control panel, still will not turn on. Changed control board. Same result. I am am getting power to machine and control board. How do I test continuity at ribbon cable. I am suspecting one of the new components is faulty, or am I missing something on this model?

Here are your parts
Parts for Maytag MDBH950AWS Dishwasher - AppliancePartsPros.com

See the attachment for the tech sheet. It has the pinouts for the keypad so you can check them with a meter.

Below is a link to a manual which may also be useful toyou.
You will have to join the site and be logged in to be able to download it.
http://appliancejunk.com/forums/index.php?action=downloads;sa=view;down=83
MDBH950.pdf (248.1 KB)