I have (after some searching of manuals etc.) checked the CMOS battery. It reads 3.01V, so is perhaps borderline but seems within parameters. Given that the computer is less than a year old (purchased in Jan) I would expect the battery to be good for a while yet!
In any case I still have the issue with fingerprints, which is the central issue I am hoping to address. Can you assist me with this please?
The device manager reports that the finger print reader is working correctly.