I have been watching this waiting for some of his feedback as to which way to go.... Yes, Power Supply or Connectors are susspect...

Remember to un plug the machine before playing in the bottom of the machine.....

I would un plug and re plug the power supply and computer connectors.... Gentle Please....

I would also un plug the FFC Cable on both ends and inspect..... Again, Enviromental over the winter... Could Moisture have caused Corrosion on the contacts?

AL