Just when I thought I've seen everything there is to my HP-27S calculator in the last 15+ years of ownership, a surprising new feature showed up yesterday. Everytime I turn the power off now, it automatically turns itself on after half a second (sometimes even 15 seconds).
This new auto-power-on feature, as I termed it, follows some bizarre beeping late last night. I was oblivious to the entire incidence as I was soundly asleep, but my wife alerted me in the morning that my calculator was beeping non-stop for hours. The beeping only stopped after I removed the batteries (the whole system froze like Windows). When I put the batteries back, the undesirable feature shows up. Thinking it might be a battery problem, I purchased and put in a new set of batteries to no avail.
I'm hoping there is something I could do to fix it. Much as I love my HP-27S, I hate to have to open the battery compartment and remove the batteries every time to turn it off. Any idea is appreciated (other than installing a power switch :), thanks in advance.