HP50g Problem turning ON

[Benetton]

Hi, thanks for the replies.
So, today I was going to try to reinstall the firmware to see if that would solve the problem. So I took the SD out, put on computer, and got the batteries (BTW the backup battery was also new last time, all batteries were) and put them inside the calculator. It sprang to life and I decided to test the issue once more before reinstalling the fw. And now it turned on.
The only difference was the lack of the SD card. So I put the sd card inside and the problem came back. Some taking it out and in sometimes, messing with the SD card lock and seems like some crazy bad connection was causing it. Right now its working. I'm thinking it may be some corosion or broken solder somewhere around the SD card slot. I'll use it for some time to see if the problem reappears and, if so, will try to open it to check the guts of my old fella.

Thanks again, I'll update the thread with the outcome, specially if I find the culprit.