I have had this TI 89 for over 8 years. It was in dis-use for the past year, sitting on my bookshelf. When I tried to use it, I found the numerical numbers 1, 2 and 3 were not working. Everything else on the calculator works just fine, but those 3 buttons won't work when I press them. I have replaced the batteries, the calculator was in its case, no water got to it. I don't know how I can go about having it fixed. Any help?
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To convert a result from symbolic to numeric, press diamond ENTER. To have all results appear in numeric form, press MODE F2, use down-arrow to get to the "Exact/Approx" line, press right-arrow, down-arrow to "3:APPROXIMATE", press ENTER ENTER.
To get a numerical value for a single result, press the diamond button then the ENTER button. To have all results come out numerically, press MODE F2, scroll down to the Exact/Approx line, right-arrow, select 3:APPROXIMATE, then press ENTER ENTER.
You can convert any symbolic result to a numeric result by pressing diamond ENTER. If you want all results to come out numeric, press MODE F2, use the arrow keys to move down to the "Exact/Approx" line, press right-arrow, select "APPROXIMATE", then press ENTER. Press ENTER one more time to save the change and exit.
Press diamond ENTER to convert a symbolic result to a numeric result. To have all results come out in numeric form, press MODE, F2, use the arrow keys to move to the Exact/Approx line, press right-arrow, select "APPROXIMATE", and press ENTER twice.
Yes. If the calculator is showing something like ln(2) for an answer, press diamond ENTER to convert to a numeric answer. To have all results come out numerically, press MODE F2, use down-arrow to move to Exact/Approx, right-arrow, and select APPROXIMATE. Press ENTER twice to save the change.
If you connect calculator to computer using Ti connect device explorer you might be able to see what files are on the calculator. I don't know if you downloaded from the web but, 3rd party programs and shells tent to miss up the calculator. This would able you to delete out possible problems which could be re installed later.
Please don't get your hopes up, but perhaps something in the following few suggestions will work:
For the TI-89 Family, TI-92 Family, and Voyage™ 200:
Adjust the contrast by pressing and releasing the Diamond Key key followed by pressing and releasing the [+] key; repeat as necessary. To adjust or lighten the display, use the [-] key.
Users of the TI-89 Titanium or Voyage 200 should see the following case before performing the following reset procedure to prevent the loss of valuable Apps. On the TI-92 family or Voyage 200, hold the [2nd] key and the [hand] key, then press and release the [on] key. On the TI-89 family, press and hold the [2nd] key, left arrow, and right arrow; then press and release the [on] key. This should reinitialize the operating system, in which you should see a progress bar filling on the screen.
Remove one of the AAA or AA batteries. Press and hold the [APPS] key, and while holding the [APPS] key, replace the battery and turn the unit on. TI-89, 92 Plus, or Voyage 200 users should see "Press I to install code...", and should press the  key. The calculator should then say, "Waiting to receive...". TI-89 Titanium users should see "Waiting to receive..." or "Waiting to received OS...". You will need to restore the calculator's operating system.
To reinstall the Calculator's operating system, take a look at the following TI site.