How do I reset the display on my TI-83 Calculator?

As a last resort, you may need to reinstall the Operating System. To do this, find someone else who has a TI-83 and borrow it. Connect a link cable between the two. On your calculator press "2nd > Link (Stat button) > Recieve > 1:Receive". On your friend's calculator press "2nd > Link (Stat button) > Send > G:SendOS" On older moldels it may be "G:SendSW". If that doesn't fix it, you could see if the warranty would cover repairs/replacements, if not, you'll have to buy a new calculator.

WARNING: The transfer will take about 30-45 minutes. If you unplug the cable during this transfer, your calculator will stop functioning and only display "waiting, please install software now" until you send it software and let the transfer finish.

Resetting Ti-83 Plus

If on and clear doesn't work it is probanly beacuse the thing behind the screen that configures the lights is broken. There is not much you can do but buy a new one.

attempt the fllowing: Press the Mode key, then opt for standard, then drift, and press enter. after that press 2d and Mode to stop. this may reset the decicimal places to standard. Peace.

on and clear does not work for a ti 83...

you need to go to 2nd - Mem - reset - reset all

(this will delete all your programs if you have any)

on and clear at the same time

on and clear at the same exact time.