My screen lost about 8 rows of pixels from the bottom so my calculator is almost useless. I was wondering if they sell replacement screens of if there is a way to fix this. I would like to avoid buying a new one. I think there might have been something that got dislodged because I have dropped it once or twice but the problem arose a day or two after I dropped it last.

Before you send your calculator off to get it fix, please try this Ti 84 plus reset. If after preforming this reset and, installing the OS, and the problem with the pixels is still present then look for a replacement.

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.
   
4. Remove 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. If this reset does not work to clear the problem then read further. Sorry to hear about your broken screen. Some people replace the screen on their own. I feel this is a bad idea, and this procedure may fail, and sometimes does not look pretty. You will be much better off to contact Texas Instruments for replacement even if (Out of Warrenty). It usually cost about ($75 for a Ti89) and, probably even less for a Ti84 plus depending on their rating usage of your calculator. For the price you pay to have a repair shop fix your calculator, you'll be much better off going through Texas Instruments. If your calculator is still under warranty it might only cost you shipping. Plus, Texas Instruments work will be guaranteed, instead of taking the chance of having your calculator rigged together. First, thing to do if you seek replacement by Texas Instruments is to contact Texas Instruments, and fill out a request for a Returned Material Authorization (RMA) number for a product replacement. You can start that process by clicking here! Once your at their web site double click the icon Customer Support Form. Simply fill out their TI-cares Customer Assistance form. They will respond quickly with an email. All you have to do is reply to that email, and you will be given a RMA number and further instructions.
   
   To contact Customer Service with out going to the Texas Instruments web site send an email to [email protected] or call 1-800 TI CARES (1-800-842-2737) Monday - Thursday 8:00am - 7:00pm or Friday 10:00am - 7:00pm Central Standard Time.