So that power option thing has been checked, drivers are updated, disk has been checked and USB cable has been checked.
And 3.5 days backup is useless, you are right.
As I remember well, not all USB ports on an Acer are the same, but you tried it on all different ports, haven't you?
It might be a hardware problem; it may be something with Windows.
Can you go back to a previous restore point from before it all started?