Old (new) HP 12C Platinum 2005/6 ON button issue

[rprosperi]

(10-27-2017 07:20 PM)Dwight Sturrock Wrote:  I would replace the batteries.

If all else fails since you purchased it new and in the package, would it be eligible for warranty coverage?

I agree, replace the 10+ year-old battery before any other testing or conclusions.

The warranty only applies to the original owner; in this case that would likely be whoever sold it (or whoever sold it to that person, etc.), as no authorized dealer would still have 10+ year-old stock.