My TI-nspire CAS doesn't want to go on! I changed batteries! Tried the contrast buttons! Nothing works

During operation of the TI-Nspire handheld it may be necessary to reset the device. Circumstances which may require a reset include; keys not responding, device will not turn on or a garbled display. To reset the device:
• Remove the keypad (for TI-Nspire with ClickPad, TI-Nspire with TouchPad, and TI-Nspire CAS with Touchpad) or the battery door (for TI-Nspire CAS with ClickPad) and remove at least one battery from each column of batteries. After 2-5 seconds, reinsert the batteries but do not turn the handheld on.
For the TI-Nspire and TI-Nspire CAS handheld units with ClickPad:
• Hold down [home] [enter] [P].
• While holding these keys press [on].
For the TI-Nspire and TI-Nspire CAS handheld units with TouchPad and the TI-Nspire CX and TI-Nspire CX CAS:
• Hold down [doc] [enter] [EE].
• While holding these keys press [on].
Please Note: For TI-Nspire Family handheld units that contain rechargeable batteries you can alternatively hold the above keys while pressing the [reset] button on the back of the handheld rather than removing the battery for 2-5 seconds.
• The device will boot up as in the previous reset, but will display a menu with the following options. Please try options 2, 3, and 4 in that order.
• 1: Cancel - The most non-intrusive reset option; no changes are made, the unit restarts.
• 2: Delete Operating System - The operating system will be deleted without deleting any documents on the system.
• 3: Delete Document Folder Contents - This will delete the user's documents, but will not delete the OS. Selecting this option is the same as using the RESET hole on the back of the unit.
• 4: Complete Format - This will delete the OS and all documents for a total wipe of the handheld.
Please note that the second and fourth option will require that the OS will need to be reinstalled

For the TI-Nspire and TI-Nspire CAS handheld units with TouchPad and
the TI-Nspire CX and TI-Nspire CX CAS:

• Hold down [doc] [enter] [EE].
• While holding these keys press [on].

Please Note: For TI-Nspire Family handheld units that
contain rechargeable batteries you can alternatively hold the above
keys while pressing the [reset] button on the back of the handheld rather than
removing the battery for 2-5 seconds.

• The device will boot up as in the previous reset, but will display a menu
with the following options. Please try options 2, 3, and 4 in that order.
• 1: Cancel - The most non-intrusive reset option; no changes are made, the unit
restarts.
• 2: Delete Operating System - The operating system will be deleted
without deleting any documents on the system.
• 3: Delete Document Folder
Contents - This will delete the user's documents, but will not delete the OS.
Selecting this option is the same as using the RESET hole on the back of the
unit.
• 4: Complete Format - This will delete the OS and all documents for a
total wipe of the handheld.

Please note that the second and fourth option will require that the OS will need to be reinstalled.

I have a doubt, when I choose to completely format the calculator it will clear your operating system, files saved on it, but the product key (ID protuto) will be deleted too?

The Ti Nspire CX CAS has a built in battery. It must be recharged. If you plug it in a wall socket or in a USB charger you should be able to use while it is being recharged.

Are you really talking about a TINspire CX or a TI NSpire. The TINspire CX (CAS or Not) comes with a rechargeable battery and an adapter/Charger. You plug the charger in an electric outlet and let it party charge. If the calculator battery fails to recharge then it must be defective. Any third party mini USB charger will recharge the battery.

The TINspire with touchpad (CAS or not) can use regular batteries or the optional rechargeable battery.
It is not necessary to connect the calculator to a computer to have it recharged.

As far as the calculator being recognized by the computer, you must install the communication software (TI computer Link Software for the older TINspire) or the TI Nspire teacher or student software for the CX. When you run the TINspire teacher or student software and then connect the calculator, you will have the opportunity to select it.

1. Remove the keypad (for TI-Nspire) or the battery door (for TI-Nspire CAS) and remove at least 1 battery from each column of batteries. After 2-5 seconds, reinsert the batteries and turn the unit on. This will cause the unit to reboot the operating system.
2. Remove the keypad (for TI-Nspire Family or TI-Nspire CAS Touchpad) or the battery door (for TI-Nspire CAS) and remove at least 1 battery from each column of batteries. After 2-5 seconds, reinsert the batteries and LEAVE THE UNIT OFF (do not turn on and then back off). If the TI-Nspire/TI-Nspire CAS is a Clickpad, hold down [Home] [Enter] [P], and while holding these keys, press [On]. If the TI-Nspire/TI-Nspire CAS is a Touchpad, instead hold down [Doc] [Enter] [EE], and while holding these keys, press [On]. The device will boot up as in the previous reset, but will display a menu with the following options. Please try options 1, 2, 3, and 4 in that order. ** The [Home] key is located at the top right of the TI-Nspire keypad and has a picture of a house on it.

Hello,
If you remove battery door, the TINspire CAS cannot be turned ON.
You may try to reset the unit by pressing the reset button on the back of the unit. If that does not solve the problem, you may try to reinstall or update the OS.

Anyway, here is what the Texas Instruments Knowledge Base has to say about reinstalling the OS. Hope it helps.

What steps are required to reinstall the TI-Nspire family operating system?

To reload the device’s OS using a computer with TI-Nspire Computer Link:
• Connect the TI-Nspire device (with the Nspire keypad) to the computer using the USB Standard A to Mini B cable.
• Open the TI-Nspire Computer Link software. The select device dialog should appear, and detect the device.
• Either drag the OS file (available in the ‘downloads’ area at education.ti.com) onto the TI-Nspire File Browser portion of the window, or click Tools -> Install OS.
To reload the device’s OS using another TI-Nspire or TI-Nspire CAS device:
• Connect the two devices using the USB Mini A to Mini B cable. The end marked A should be inserted into the sending unit, while the end marked B should be inserted into the receiving unit.
• On the sending unit, access the document chooser by pressing [Home] [7]. Once in the document chooser, press [Menu] and choose 9:Send OS…
NOTE: Users can only send an OS to a unit of the same model. Users cannot send an OS from a TI-Nspire to a TI-Nspire CAS.
Please see the TI-Nspire guidebooks for additional information.

Hello,
Here is what the TI knowledge base says about a calculator failing to turn on.

For the TI-Nspire™ Family:

1. Remove thekeypad (for TI-Nspire) or the battery door (for TI-Nspire CAS) andremove at least 1 battery from each column of batteries. After 2-5seconds, reinsert the batteries and turn the unit on. This will causethe unit to reboot the operating system.
2. Remove the keypad(for TI-Nspire) or the battery door (for TI-Nspire CAS) and remove atleast 1 battery from each column of batteries. After 2-5 seconds,reinsert the batteries and LEAVE THE UNIT OFF (do not turn on and thenback off). Hold down [Home] [Enter] [P], and while holdingthese keys, press [On]. The device will boot up as in the previousreset, but will display a menu with the following options. Please tryoptions 1, 2, 3, and 4 in that order. ** The [Home] key is located atthe top right of the TI-Nspire keypad and has a picture of a house onit.

Note: • TI-Nspire family model options 2 and 4 above require that the OS be installed. The reset menu will only display if the unit is off and batteries have been removed/replaced as described above.

1. Cancel - The most non-intrusive reset option; no changes are made, the unit restarts.
2. Delete Operating System – The operating system will be deleted without deleting any documents.
3. Delete Document Folder Contents – This will delete the user’s documents, but will not delete the OS.
4. Complete Format – This will delete the OS and all documents for a total erase of memory.

Hope it helps you solve the problem.

Hello,
Here is what the TI knowledge base says about a calculator failing to turn on

For the TI-Nspire™ Family:

1. Remove thekeypad (for TI-Nspire) or the battery door (for TI-Nspire CAS) andremove at least 1 battery from each column of batteries. After 2-5seconds, reinsert the batteries and turn the unit on. This will causethe unit to reboot the operating system.
2. Remove the keypad(for TI-Nspire) or the battery door (for TI-Nspire CAS) and remove atleast 1 battery from each column of batteries. After 2-5 seconds,reinsert the batteries and LEAVE THE UNIT OFF (do not turn on and thenback off). Hold down [Home] [Enter] [P], and while holdingthese keys, press [On]. The device will boot up as in the previousreset, but will display a menu with the following options. Please tryoptions 1, 2, 3, and 4 in that order. ** The [Home] key is located atthe top right of the TI-Nspire keypad and has a picture of a house onit.

Note: • TI-Nspire family model options 2 and 4 above require that the OS be installed. The reset menu will only display if the unit is off and batteries have been removed/replaced as described above.

1. Cancel - The most non-intrusive reset option; no changes are made, the unit restarts.
2. Delete Operating System – The operating system will be deleted without deleting any documents.
3. Delete Document Folder Contents – This will delete the user’s documents, but will not delete the OS.
4. Complete Format – This will delete the OS and all documents for a total erase of memory.

Hope it helps you solve the problem.

Hello,
Try the other recipes from the TI knowledge base concerning a calculator failing to turn on

For the TI-Nspire™ Family:

1. Remove thekeypad (for TI-Nspire) or the battery door (for TI-Nspire CAS) andremove at least 1 battery from each column of batteries. After 2-5seconds, reinsert the batteries and turn the unit on. This will causethe unit to reboot the operating system.
2. Remove the keypad(for TI-Nspire) or the battery door (for TI-Nspire CAS) and remove atleast 1 battery from each column of batteries. After 2-5 seconds,reinsert the batteries and LEAVE THE UNIT OFF (do not turn on and thenback off). Hold down [Home] [Enter] [P], and while holdingthese keys, press [On]. The device will boot up as in the previousreset, but will display a menu with the following options. Please tryoptions 1, 2, 3, and 4 in that order. ** The [Home] key is located atthe top right of the TI-Nspire keypad and has a picture of a house onit.

Note: • TI-Nspire family model options 2 and 4 above require that the OS be installed. The reset menu will only display if the unit is off and batteries have been removed/replaced as described above.

1. Cancel - The most non-intrusive reset option; no changes are made, the unit restarts.
2. Delete Operating System – The operating system will be deleted without deleting any documents.
3. Delete Document Folder Contents – This will delete the user’s documents, but will not delete the OS.
4. Complete Format – This will delete the OS and all documents for a total erase of memory.

Hope it helps you solve the problem.