Good morning Del,
I am Tech Michael, I have been a hands on technician since forever lol.
My hobby is building intelligent robots so I always had a love hate relationship with all electronic devices.
In this case I do know your unit well. You are on the right track, the supply is bad. it will show the correct voltage 5.0 vcd, but it can not sink the current. In essence there is only a ghost voltage with no push behind it.(current as you mentioned).
With this you would do well to replace the power supply.
If you want you can try repairing the one in the unit but that will require a lot of testing. If you do want to do that I will help as much as possible from my end.
Also I may be able to locate a new supply board for you.
In any case, I will stick with you until this is complete.
Please rate kindly thus far, it won't cost you anything to rate my service to you kindly,
Then you can reach me by simply replying to this message anytime.
Thank you and have a wonderful day!