Dolphin Power Supply On /Robot Not Working

Greetings ! I have a weird issue with my Dolphin Pool Cleaner. It is a Qauantum 1.5 yrs old. The power supply comes on but when you start the robot it will not run and I do not see the blue light on, that is on the front of the robot . Any suggestions ?
Have you checked the cord that runs to the robot?

Try a continuity test to see if there are and breaks in the line.
 
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