If you haven't tried this already, adjust the brightness (2nd + Up Arrow). Also, the backup battery, which is removed by unscrewing a small plastic panel in the battery compartment, may need to be replaced as well.
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Take out the batteries. Also take out the backup battery. It is a button battery beneath the screw in the battery compartment. Check the button battery volts with a multi-meter. After 5 minutes put the button battery back in and then the fresh batteries. It might work now. Alternatively take out a battery, then hold the clear button and put the battery back in. Then try to turn on. If it still does not work take out a battery press the del button and put the battery back in.
TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.
Push down the tab and lift off the battery cover on the back of the calculator.
To replace the four AAA batteries, simply pull them out and put in new ones, following the polarity indicators. To replace the backup battery, unscrew the cover, pull out the battery, put in the new one, and replace the cover.
1. Remove 1 AAA Battery 2. Press and Hold 'ON' for 30 seconds 3. Replace AAA Battery 4. Adjust Contrast to appropriate level
If this fails, try again with ALL Batteries removed including the backup Lithium Battery.
If all else fails, try the following reset procedure:
1. Remove ALL Batteries (inc. Backup) 2. Let Calculator sit with no batteries for 2~4 hours. 3. Hold 'ON' for 30 seconds. 4. Replace all the batteries (May be good idea to use new batteries just in case old ones were dead) 5. Turn on Calculator 6. Change Contrast to appropriate level
- Remember to use correct batteries or calculator may not work. The correct batteries are Alkaline, Rechargable Batteries are TOO WEAK, Heavy Duty batteries are TOO STRONG.
Well, in most calculators, the action of taking out the backup battery practically clears the whole thing. Memory, everything. I myself have a Ti-89 and have not yet experienced this problem, but I have on an older Ti-82 and removed the backup battery and the whole thing is dead now, or at least nothing happens when I turn it on, even after replacing the batteries again. If you still have the manual, I would check out the troubleshooting. If you don't have it, try to find it online. And if you have done both of these things, try getting hold of technical support through Texas Instruments.
Batteries: Make sure to replace the "battery backup" too the little lithium ion battery
Try Adjusting contrast:
Hold down "[2nd]" key press up or down arrow repeatedly to lighten or darken contrast.
First attempt reseting: Step 1: Remove all the batteries Step 2: Hold "Clear" key down Step 3: Still holding "Clear" key reinstall batteries Step 4: Still holding "Clear" key press "On" key until home screen is displayed.
Second shot reseting: remove all batteries including lithium ion (backup battery), wait 3 hours and reinstall batteries.
Third Shot reseting:
Step 1: Remove a battery
Step 2: Hold down "DEL" key reinstall battery
Step 3: Possible msg pops up saying "Waiting ... Please install software" IGNORE msg and take out battery again Step 4: Reinstall battery do not hold down "DEL" key
reseting will cause the handheld to loose all of its stored memory.