HP48GX Boot Loop - help

[wmundstock]

Hi All.

Have anyone seen an old HP 48GX with a bootloop problem like this?
Any suggestions? Basic troubleshooting steps did not work.

https://youtube.com/shorts/gmMI6rGGFSU

What I tried.
Hidden RESET Button - turns the calculator off, then when I turn on it goes back into that loop.

After resetting I tried:
1. On + C
2. On + A + F
3. On + D

Remove batteries, etc all tried.. No luck.

Note how when I hold the on key, it speeds up the beeps. Almost seem like a short... maybe capacitor damaged?

Any advice is welcome!