Yamaha CP73 Powers on but knobs, switches, and screen don't work

Hi! Happy New Year!

I own a CP73 and a CP88. They’ve both been absolutely fantastic to me, and I love them. However, the other day I was hooking up my 73, and noticed that although it had powered on, there were no lights. I powered off and back on again and I couldn’t get sound from the keyboard, the lights were off in all of the sections, and I couldn’t even operate the screen. I continued to try and turn it off and on using different outlets and power cables, and the most I would get is it working completely for around 2 minutes and then reverting to the state of nothing working. I would love some guidance on this issue and would be glad to add any necessary details!

Thank you so much!