TI-84 Error Fixes & Troubleshooting

Your TI-84 Plus CE runs a calculation but nothing appears on the graph screen? This guide covers all 7 reasons why the graph may be missing and exactly how to fix each one.

Calculator shows "Validating OS" and won't boot? This is a known firmware loop. Follow these exact steps to break out of the loop without losing your programs.

TI Connect CE says "No calculator detected" even though it's plugged in? Here are the 5 most common causes and how to fix them on Windows and Mac.

Getting a long decimal when you expect a fraction? Learn 3 ways to display exact fractions on the TI-84 Plus CE — including the MATH→Frac shortcut and changing default settings.

What does ERR:SYNTAX mean? What about ERR:WINDOW RANGE or ERR:DOMAIN? This guide explains every common TI-84 error message and how to clear it.