EDIT: SOLVED
see last post

As the title says, my TI Nspire CX II CAS (what a mouthful) only turns on at all when plugged in to USB power. When plugged in, it shows the startup screen and starts to load the home screen, then immediately goes to black and repeats, as if the reset button was pressed. This happens regardless of whether the battery is in the calculator or not. The reset button is not stuck down, and pressing it does nothing.

Video:
https://imgur.com/a/yVEz3GB
Quote:
only turns on at all when plugged in to USB power

That sounds like a battery issue. With my experience in repairing school Chromebooks, the Chromebook with a dead battery sometimes claims that it is fully charged upon connecting to a charger, but immediately shuts off upon removing the charger.
I recommend replacing your battery for a new one. That probably would fix that.

For your other problem, here is a list of steps I would advise you to take before replacing your calculator.
1. Follow this guide by TI.

2. When you reinstall the OS, use n-link to install an OS earlier than 6.0.
You can find the OS version of your choice on TI-Planet. 5.3 is what I recommend to use.
Note: You won't be able to downgrade from your current OS version.

3. If all else fails, contact TI-Cares™.
I had this problem when I bricked my nspire when I first got it. Resetting it did nothing and same with deleting all the memory using the maintenance menu. Then I took out the rechargeable battery and put it back in, and it got out of the loop. You may have already done this though. I had a similar problem with another nspire that I got recently, where it wouldn't turn on unless it's plugged in. Once again I was able to fix it by taking out the battery.
Thanks for the suggestions.
clevor wrote:
the Chromebook with a dead battery sometimes claims that it is fully charged upon connecting to a charger, but immediately shuts off upon removing the charger.
I recommend replacing your battery for a new one.


The calculator never gets to show what battery it thinks it's at, it just gets to loading the OS then restarts, so I can't see anything. I did measure the voltage of the battery itself and it seems to be dead, but the calculator still works (bootloops) when plugged in with the battery removed.

clevor wrote:
2. When you reinstall the OS, use n-link to install an OS earlier than 6.0.

I would try to do this, but the calculator never loads enough to be detected by my PC

Calculatordream wrote:
Then I took out the rechargeable battery and put it back in, and it got out of the loop

I tried this, but it resumes the loop when I put the battery back in.
Update: I got it working!

I'm not sure what exactly what I did that finally allowed it to stay on the install OS screen long enough. When I went to troubleshoot it again today, it decided to recognize the battery again and load the OS install screen.

Here's the steps I took in case it helps anyone else

1. I entered maintenance mode by holding [doc] [enter] and [EE] while the calculator reset (you may have to press the reset button)
2. I formatted the memory and deleted the OS
3. I entered a developer menu by pressing [9] while in maintenance mode, and played around with all the options there, especially the diagnostics and the OS loader options.
nice! speaking from experience, its such a relief to get it working.
  
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