When i turn on the calculator i get a dark screen and when i try to adjust the con trast it doesnt change

Okay; Have you tried adjusting the contrast? This is a common problem with Ti calculators. Try pressing 2nd and up. This will darken the screen. If the screen becomes too dark press 2nd and down to lighten it. Happy Calculating

Having gone over a month with no response, I assume this is no longer a problem.

Turn the calculator on. Press and release the 2ND key. Press and hold the Down-arrow key.

There is a strong probability that your calculator is functioning correctly. The problem is that after replacing main batteries the screen contrast may become too dark or too light (your case).
To fix this "problem" you must adjust the contrast.
To darken screen:

1. Press [2nd] key and release it.
2. Press and HOLD the UpArrow
3. Keep pressing UpArrow until screen is dark enough.

Try this adjustment. I am confident it will bring your calculator to life.
If it fails, post a comment to this thread and I will give your additional diagnostic procedures.

To adjust the contrast, turn the calculator on. Press and release the 2ND key. Press and hold the Up-arrow to increase or the Down-arrow to decrease the contrast.

The problem may be due a screen that is too light to see anything on it. Adjust the screen darkness.

1. Press [2nd] key and release it.
2. Press and HOLD the [UpArrow] to draken screen.
3. Release the [UpArrow] when screen is dark enough.

You can also connect it to the computer to see if TI Connect finds it. If it does, update the OS to version 2.53MP.

You change the backup battery if the calculator tells you RAM CLEARED each time you turn it ON.

Hi,
Check that the terminals in the battery compartment are clean and shiny. Remove any powder left after battery leakage. Insert fresh batteries in calculator. Make sure you respect the polarity diagram. +-+- (Many malfunctions come from incorrectly placed batteries).

To adjust the screen: Darken or lighten display

To darken screen
Press [2nd] key and release it.
Press and hold [UpArrow] until screen is dark enough.

To lighten screen
Press [2nd] key and release it.
Press and hold [DownArrow] until screen is light enough.

Hope it helps.

The "color" on your screen reset to dark. You can adjust it by pressing "2nd" and the "up" arrow (or "2nd" and "down" arrow) repeatedly.

try pressing 2nd-> "up arrow" to adjust the contrast, keep doing it and it may solve ur problem

Did you try [left][right][2nd][on]? It reinitializes the memory and clears the ram.