I'm sorry
I've never really had anything other than my TI84, and nobody's really given advice other than check what file I was installing. .tno IS for non-CAS, am I right? [I thought CAS was .tnc] I just need help, man. I'm clearly an idiot when it comes to these calculators, now can we like, move on? I seriously don't know what to do with this

The Computer Link software just asked me to update and install so I did. Which software version should I use, and can I have a link?

I'm taking the SAT tomorrow and I'm seriously freaking out.
I bought this Nspire [non-CAS] a couple weeks ago. It's been doing pretty well until just recently, where my display would just get all screwy when I'd use a function [I was only using the find roots function for polynomials] and after a couple of resets [where I would remove and reinsert the keypad], it would just tell me that it couldn't find an OS and I needed to reinstall it.

So, I install the Computer Link software, pop a MiniUSB cable from it's plastic [first time used] and have it download and install OS 3.1.0.392, and after waiting five minutes, it tells me it's not responding. I google some keywords and it tells me that I need to reset it via doc-enter-ee key combo. I complete reformat, and actually get some [very little progress] when I try to reinstall the OS, but soon enough it'll tell me I need to reinstall. I'm taking this SAT in a couple hours and I feel like I'm about to pass out. What the heck is wrong with this thing?

Chris