HP48GX Boot Loop - help

[Kiwi]

I was given (for free) a HP48GX with the exact same symptoms. I also tried everything to get it working again but without any luck. Once, by changing the batteries (with another brand), I was able to get past the 'Try To Recover Memory' loop but got stuck again at the Home screen. After months of trying I gave up and decided to open it up.
Once opened, I realized that the previous owner probably left the batteries inside the HP48 because there was some battery corrosion which was almost invisible when closed. The biggest corrosion was near the negative terminal and it did attack the keyboard layers, resulting in a non functioning keyboard.
I'm not sure whether your unit has the same problem but maybe you can have a closer look at the negative terminal in the battery compartment and try to look inside the case for any corrosion.

Hope this helps.