So, I guess I might say that I own a TI-Nspire CX CAS, and that is partially true. However, the one I use is my brother's, because mine broke...
I was wondering if I could take it apart, but I am not able to without buying outrageous types of screwdrivers...
Ok, now to the description of the problem. I originally thought that these problems were caused by Ndless, but now I realize it is probably a hardware issue.
So, one day, I discovered that the screen looked corrupted on my TI-Nspire. I kind of freaked out (I think? I don't remember...) Anyways, once I reset it, it was fine, until it corrupted again. Sometimes it would boot with the old non-color TI-Nspire boot screen, which I didn't think was possible for a CX model. Eventually I had to press on+reset at the same time to get it to boot. Reinstalling the OS and formatting the device did not work. Nearing the end of its life, I had to actually twist the calculator to get it to boot. Yes, I had to physically twist the calculator, which was probably the best indication that it was a hardware problem. Now, it won't boot at all...