So I've run into a problem which is basically exactly the same as this one:
http://www.omnimaga.org/general-calculator-help/ti-nspire-cx-cas-weird-behavouir/
However, the OP in that particular topic never had his problem resolved (other than sending it into the factory). I have no idea why it happened; it was working fine one day, and dysfunctional the next.

Basically, after booting the OS, few of the buttons function as intended. Turning off the calculator works fine, but turning it on causes it to crash and reboot. Examples of incorrectly mapped buttons:
8 -> a, 2 -> b, b -> cos(, = -> sin(, Shift -> del, etc.
Many of the buttons on the bottom part of the keyboard type in symbols, but not the correct symbols. A few buttons still work, like
esc, tab, menu, ctrl; however, the vast majority are not functioning. Some don't seem to have any function whatsoever, and the result is that some buttons simply aren't mapped by others (I'm missing some functionality, even if I did record a table of what maps to what). The arrow pad doesn't work at all.

I'm fairly certain the issue isn't a hardware problem, because when in the maintenance menu, the keys work fine - and accessing it works fine. I can also access diagnostic software (although the arrow pad still doesn't work in this menu, meaning that I can't access some tests at all. The TouchPad KeyBoard test reports as fail, however (also the battery test reports as fail, which is weird, since I've never had any problems with my battery).

So far, I've reformatted the OS (running 3.6.0.550). My calculator serial is P-0612E. Can somebody please help me find out the issue (and how to solve it?). If not, how does one install Linux so I don't have to deal with this OS?

If you need any more information, please let me know.

EDIT: I did install Ndless and Nover 3, but I don't think they were the issue.