Why does my Texas Instruments Model #TI-504511A hum?

SOURCE: Where is the factorial button (x!)

Math button, then over to PRB and it's selection four

SOURCE: my texas instruments ti-30Xa doesn't turn on!

It has a solar battery. It has to be in the light, either sun light or artificial light to operate. HOWEVER, if the battery is shot, it must be replaced. Take your calculator to any radio shack store and ask them to test the battery for you. If it is no good, they will be able to replace it for a fee.

SOURCE: texas instruments TI 38 PLUS USAGE

Hello,
Here is the link to free downloads of TI graphing calculator's guides.

http://education.ti.com/educationportal/downloadcenter/SoftwareList.do?website=US&tabId=2&paneId=17

Enjoy

Hope it helps

SOURCE: Texas instruments TI-83 Plus won't turn on

Hello,

Check that the batteries are correctly inserted.
The screen may be too light to see anything.
To darken it
Press [2nd] key and release it.
Press and HOLD [UpArrow] till it darkens enough.

If that does not solve the problem here is what the TI Knowledge base has to say. Please read till the end. I hope it helps.

For the TI-83 Plus Family, TI-84 Plus Family:

Caution: 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. Adjustthe 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 TI83-family or Ti84 Plus family to reinstall the calculator operating system (see below.)
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.

Reinstalling the OS fot the TI84Plus

How do I correct the Error Waiting...Please Install Calculator SoftwareNow message on my TI-83 Plus family or TI-84 Plus family calculator?

If an operating system (OS) update fails or is interrupted, the calculator will be in an inoperable state with the message Waiting...Please install calculator software now.The most common cause of a transfer being interrupted is updating the operating system on a calculator with low batteries. Users will need to use the TI Connectivity cable and the TI Connect to send the operating system to the calculator. Make sure to have the latest version of TI Connect installed on the computer.
In order to install the software please follow these steps:
1. Connect the TI Connectivity cable between the computer and the calculator.
2. Click on Start >> Programs >> TI Tools >> TI Connect >> TI OSDownloader
3. Follow the on-screen directions to reinstall the calculator's OS.
If the message "Error! Press any key to turn unit off. Then turn unit back on." appears on the graphing calculator, quickly, remove one battery from the calculator and reinstall it while the transfer is taking place.

If that does not solve the problem, you should contact Texas Instruments at [email protected] or www.ti.com/calc.

SOURCE: my texas instruments ti-86 is dark all the time,

Hi,
After changing the batteries the calculator is restored to factory defaults, but the screen contrast may change. The screen may be too light to see anything or., as in your case too dark.

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

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

Hope it helps.
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