When I tried to switch my calc on today in school with the power button, it showed very short the homescreen and then it restarted like i pressed the reset button on the back.
I thought that some ndless stuff maybe did this, so I let it reboot. Then I noticed, that only a few keys worked. Esc, ctrl, tab, menu, enter and ctrl + home work properly, the rest is totally messed up. After ctrl + home the calc goes off, when I press on again, it crashes like I described. For example, ctrl + 0 acts like the scratchpad button. doc works as the home button. shift like del. And so on. Some keys are not mapped at all. Touchpad is also dead.
I cant go to the menus from boot1 or boot2, when I press the standart keys (e.g. esc + menu + minus) nothing happens, when I press the keys so, that it should work (in my case esc + menu + q (q is mapped as minus)), nothing happens, too.
I reinstalled the OS, no change. Even unplugging the battery did not help.
When everything worked ok, I had the ndless 3.1 beta installed and the cpu was running at 210 MHz, the AHB was not in red text.
Everything worked ok for months, until today morning. Maybe I have still warranty on it.

Please help me! I need the calc for school!

ctrl+0 actually opens up the scratchpad.

Ok, I did not know this.

When I delete everything on my calc with TILP, can TI find out that there has been ndless installed or something?

Not easily, but potentially, if someone looks at raw NAND Flash data and erasing files remotely does not trigger sector erases in Datalight Reliance / FlashFX, yes, it can be possible to retrieve your data.

Use the maintenance menu to reformat all memory, then use diags software to clean up the SRAM.

Sorry for posting in here again, but I think when I modify my last post, noone will notice...

Everything is ok now, I sent my CAS to the 'factory' where my school bought it and then a few weeks later I got a completely new one. Currently, I do not have ndless installed or something.
I installed ndless for a classmate (date: 7 March 2013) who wanted to have pokemon on his calc, so I did that for him. He has now ndless, GBA and GBC emulators and nover which is in ndless startup folder and is set to ~200MHz CPU and Base, the text for the bar for the filesystem is not in red color.

Today, after the holidays, he said to me that his calc won't charge anymore, neither on pc nor with a USB charger. I experienced this also with my old CAS, it did not charge. Today, our teacher put his CAS in the docking station and even there it did not load, it did not even boot, the display was black.
I fixed that problem on my calc with booting and skipping ndless startup folder by holding Esc while booting. Then I could charge that thing. But the CAS of my classmate won't even turn on.
I suggested swapping batteries and try charging it with another CAS, but teacher and classmate said no.

So ndless/nover somehow destroys the calcs?
Can the CPU overheat by overcloking it too much?

So what happens when it is plugged into a pc?