@gdanko
The chances of all four of my A500s dying are very slim. I paid probably 50USD for all of them.
Have you checked the batteries lately?
Here's my A500 as it looked a few weeks ago, notice the corrosion on the legs of the nearby chips and resistors.
It's now had the battery removed and been cleaned up and will be having a coin cell type battery fitted instead.
It turns out that coin cell holder from a dead PC is a drop in replacement. I just hope no lasting damage was done, as it had started playing up a bit.
