Answer to "Why won't my Ti84 Plus CE turn on?"I had this same problem. Green light was on, I believed it had a full charge but nothing. I tried the reset button. I then plugged it into my computer (hoping my computer recognizes my calculator)and at that time I noticed that the mini usb was not inserted fully into the calculator. So, pushed it in a bit more and the light changed from green to orange and it powered up. I read in other troubleshooting forums that the light operates separately from the rest of its calculator bits. So, maybe it had enough charge to power up the “on” light but not enough for the calculator to charge itself.