Weird lines, characters, symbols etc.

Honestly, I do not understand what you mean. This calculator is designed to run commands one after the other. You may stack a few of them only if you do not need the output of the first ones.
Anyway, the memory is limited and that includes the register where the current line is stored. If you enter too many characters, the calculator stops accepting them and the cursor will change shape.

If memory is full you can no longer do anything. One simple way to regain some working memory (RAM) is to clear entries (the commands you typed). Press [2nd] [+] to enter memory managem2nt and select the command ClearEntries. You can also select ClearAllLists, or Reset. For the last choice you can then choose to reset ALL RAM.

Remove the print wheel, look for broken or bent spokes. Turn it off and on it should reset itself.

DickyO

May i know for how long you have been facing this issue now?
And what exactly do you mean by "entire left side of keyboard comes up with weird symbols and characters"?
The on-screen keyboard comes on your screen?

Have you enabled the On-screen keyboard feature in control panel?

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sounds like liquid in the keyboard, try plugging in a usb keyboard.

Would it help if I told you that all the precision you are apparently looking for has no meaning?. In any number resulting from a scientific calculation only a limited number of digits are truly significant.
If you are entering characters (numbers, symbols, letters, etc.) the calculator keeps accepting them until its memory is full. At this point the cursor changes and go from a solid rectangle to a checkerboard-like rectangle, and you cannot enter anything anymore.

But if you are calculating some meaningful expression, the calculator displays the result according to the display mode you selected: Normal, Scientific, or Engineering). However, even in normal mode, if a number is too small, or too large, the calculator displays it in scientific format.

Scientific format
This format is as follows

1. A minus sign if result is negative. If positive (+) is omitted.
   
2. One digit
3. Decimal mark (.) or (,) according to configuration
4. A certain number of decimal digits (maximum 9)
5. The E to symbolize ( times 10 to the power of)
6. A minus sign (if exponent is negative), nothing if positive
7. A maximum of 2 digits for the exponent of the power of 10. The maximum exponent you can have is 99

Let us count the number of possible characters in a display
-1.123456789E-12. That is 16 character slots.
Try playing with the number 987654321123456. All you will see is 9876543211E12. The 23456 sequence disappears, and all that "precision" is lost. Why, may I ask, should you worry that your calculator is not displaying more that 13 characters on the left.

This is what I understood from your one-liner of a question. And because it is a rather cryptic one-liner, I may have gotten the whole problem wrong. If that be the case, do not just shoot down the answer, post a comment to the solution describing what you are trying to do. If it is a bona fide worthwhile concern, I will do my best to help you with it. If on the other hand, it is jus plain idle doodling I will leave it at that.

possibly water damage... there might be an indicater of this such as one on a cell phone. behind the battery possibly, a small sticker that changes color when dampened.

as for solutions... warrenty? lol

The symbol on the left of the Ysub1,2,etc. determines what type of graph it is. move the cursor to the left of Ysub1,2,etc. and hit enter

I had the same problem Jozhy. I fixed it by re-upgrading the OS using the latest version of TiLP (TILP2 version 1.04). When I tried it using the version of TiLP 2 that I had it didn't fix the problem. I understand that the version before the one that was released a few months ago didn't flash the OS correctly. Try it again after downloading the latest program.

I've had a similar problem in the past with my TI-86. It still happens sometimes when I don't use it for a while. To fix it, all I did was set the screen to its darkest setting and left it on for 10 minutes (keep it from turning itself off, by pushing buttons every few minutes.) It works great, and the calculator is fine unless you leave it unused for a month or so. A similar solution may work for you.

Hi. I suspect your calculator BIOS is corrupted. Still looking for the download for that though. Do you have a USB link cable? If so, plug in your calc and check your device information. See if anything comes up.