Try doing a hard reset (hold simultaneously Left + Right + 2nd + On). If it just isn't wanting to display properly, but does turn on, that might help. I think you can do the same thing by taking the four AAA's out and the spare CR1616/CR1620. Otherwise, the battery acid probably ate one of your components and it's time to repair/replace your handy-dandy.
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First try the reset code which is pressing Left-Right-Shift and On at the same time. If that doesn't work you can try removing the batteries and putting them back in while holding the (-) and ) buttons.
If those don't work, there is a back-up battery located under a panel just above the four normal batteries underneath the battery cover. Removing this in addition to the four normal batteries should reset your calculator entirely.
If none of these work then there may be a short in the circuits of your calculator which could have been caused by leaking batteries. In this case you can try disassembling the calculator (being careful to remember how it goes back together) and cleaning the circuit board with circuit cleaner.
Try this, hook up new battery and go to MODE and darken and lighten the screen.. do it ten to fifteen times. if that doesn't help, try hook up most left and most right's battery terminal to a DC supply at 4.5V. dont go above 4.5 it will fry your calc (it is design to handle 3V). now you are forcing extra juice into the dead LCD screen lines... and reapeat the MODE + darken trick. I fixed mine like that! Works! and remeber to leave it completely black(darkest) for a while to keep that dead line alive!
I've did the same thing but, with Ti Connect Device Explorer software, I was able to reinstall the OS software. If it is that unresponsive take out all batteries including the backup battery for about 4 hours. I had to do that one time just to get unlocked from the graphing APP. Ti one time told me to miss with the arrow and ESC keys, and it works sometimes. Good Luck, and I hope this helps your posted problem.
I have a regular TI-89 (HW2)...have had it for 6 or 7 years. Suddenly it's doing the same thing. I have to put new batteries in it every week or so. I even replaced the backup Li-Ion battery. I'm getting really tired of buying new batteries but don't want to go shell out 100+ for a new one.
Anyone have anything on this? I'm having trouble finding much on this...
Hey, i have nearly the same problem and now finally found a solution to it.
In my case half of the screen was empty and the other worked correctly AND slight pressure to the frame surrounding the display on the side of the defect half and/or above the display makes the display reappearing again. Because it's annoying if you always have to press with one hand on your calculator while working with it i did the following:
Important: Make sure that...
... you have a backup of the data stored on your TI because you could lose them during the following procedure.
... we are really talking about the same problem.
... this hints come without any warranty and you might destroy your calculator completely following this advice.
1. Open your TI 89 as described for example in 
2. Take a piece of foam rubber and cut out a stripe with a shape like |_ or "L", about 1cm in width which fits approximately the frame around the display on the the defect side and the top.
3. Place the foam rubber on the silver shield you see after opening the back of your TI.
4. Then you can assemble your calculator again.
I hope i could help you!