Unstable 49G

[DavidM]

(03-19-2016 01:06 PM)Csaba Tizedes Wrote:  

(03-19-2016 12:53 PM)Tugdual Wrote:  Looks like the RAM is fried.
Did you try to reset memory?

First I want to update/downgrade(?) the ROM to the highest stable version, maybe that is will be help, but my problem is that, the calculator is continously fails, going to reset or simply not responses to keystrokes, therefore I cannot go to the Diagnostic mode and after that to the Terminal mode.

On the very slim chance that the vestiges of a library in port memory is causing problems, you can also try a warm-start (ON-C) followed immediately by holding down the backspace key, which should disable the automatic library attachment process.

I agree with the others who are suggesting this looks more like a hardware issue, though.

I believe the 49g has a self-test in ROM, and you may want to attempt to run the various options to see what happens. The self-test is normally activated by pressing ON-D after the system is powered-up, presuming it's stable enough to do that. Your description of "I cannot go to the Diagnostic mode" makes me think this won't work, though.