Thanks for the post and resulting solution.
The same thing just happened to me.
I Purchased the machine. the owner said it worked but he lost the keys.
I transported it on it's side.
I got home and drilled the lock out.
I powered the machine up and nothing worked other than the utility light inside the cabinet.
I found your post, removed the reels to look at the power supply and there it was....the power supply slid to the left and unplugged itself.
Its powered up now with an issue....call attendant is flashing alternately with ram error...
That's it for today...tomorrow is another day...🙂