I just got my new calculator for school yesterday and I was playing with different buttons to see what they did and on accident, I lowered the lightness to 0 and I can't get the screen to light up again, how can I fix it so I can see my screen once again? Idk what to do w/ it, it was an expensive calculator, over 100$.

Caution: The resets described in these troubleshooting steps will cause a loss of applications, programs and data. If at all possible please create a backup using TI Connect™ first.

1 Try a new set of AAA batteries.
2 Adjust the contrast by pressing and releasing the [2nd] key followed by pressing and releasing the up arrow; repeat as necessary. To adjust or lighten the display, use the down arrow.
3 Remove one of the AAA batteries. Press and hold the [CLEAR] key. While holding [CLEAR], reinsert the AAA battery and then turn the calculator on. The calculator should display the message "RAM Cleared". Release the [CLEAR] key and then press it one more time to remove the message.
4Remove one of the AAA batteries. Press and hold the [DEL] key. While holding [DEL], reinsert the AAA battery and then turn the calculator on. The calculator should display "Waiting...Please install calculator software now". Follow the instructions for the TI-83 family or TI-84 Plus family to reinstall the calculator operating system.
5 Remove all of the batteries including the round lithium battery for 5 minutes. After the 5 minute period, reinsert all of the batteries and turn the calculator on. Adjust the contrast if necessary.

This is what happened, but I can't get my screen back. :/

guide book for it:
http://facstaff.bloomu.edu/skokoska/TI84PlusGuidebook.pdf

This post was edited by implite on Aug 26 2011 07:43pm

On my scientific calc, the bolded number suggestion in your second post works.

You should be able to press the second key and then the hold the up arrow to make the screen brighter.

I tried, I have no idea why it didn't work though... :/ Like that's how I turned the screen off, now it doesn't wanna go back on, sucks.

Are you holding down the up key after pressing the second key or are you just taping it?
In order to adjust the brightness, you'll need to hold the arrow key down - pressed down.

The up arrow key will make it darker, the down will make it brighter.

Max up = black
Max down = transparent / not visible

Mine is max down, and tried holding and tapping it, I think I was holding down tho Ima try up arrow, let me grab it out of my bag.

That should work.
Press second key - let go - hold down up key

You'll want to stop it at roughly setting 5. That's the easiest to read imo.

Hmm, well that didn't work and since I tried following all the other steps as well, I guess my calculator is randomly reset and I have no idea what to do w/o the screen. :/

Strange.
Alright, take out the batteries and wait a couple mins.
Put them back in and try again.

That should fix the issue