50g - strange power on problem

[e_emil]

Just wanted to say hello to everyone, I'm new on this forum.

After some time of using various casio's and TI's, I just came in possession of my first HP calc It's a 50g, used, but visually in great condition.

When it arrived it wouldn't power on at all, despite changing batteries (main and backup; it came with old batteries inside). Trying a hard reset didn't help either - just a blank display with no sign of life... I checked all connections inside the battery compartment with a voltmeter and there was always a good stable voltage as far as the probes could reach. Trying to power it on with a usb charger and no batteries didn't work either.

I finally left it without batteries for some time, and when I re-inserted batteries after maybe half an hour, it resurrected! It's been working great ever since (well I own it for no more than three weeks but it's heavily used, on a third set of batteries already) and I've never had any more problems with it.

Any ideas about what the problem was and why it disappeared?