The key is marked x-superscript-negative-one and is just below the MATH key on the leftmost column of the keyboard.
SOURCE: TI 84 cant turn on
Sounds like your pc had a static charge that it discharged to your TI and that it fried something inside the TI. No warranty, No fix. You gotta buy a new one.
SOURCE: comma key on TI-84 Plus Siver Edition calculator.
The comma key on the TI 84 SE is above the 7 key, and it is just left of (, right of x squared, and below SIN. thats where the "," key is. If you're asking something else, please clearify. My understanding is that you don't know where the comma key is.
SOURCE: Ti-84 Silver Edition received water damage and cant be switched on
try this :
This works on most mini electronic devices like cellular phones and degital cameras etc .
it sounds crazy .
Remove the back (or Cover ) of the phone( or Camera ), battery, and SIM if your phone ( or Device ) uses one , DIRECTLY
.
Then, with a q-tip (or something similar), dab the connection points (shiny, goldish) on the battery, SIM, and phone. This should aid in drying.
Finally, place all contents in a bag of uncooked rice (separately, do not put back together just yet). it sounds crazy , but it draws the moisture out.
It normally is working after just 7-8 hours, but I would wait 12 hours or even 24 hours before attempting to use (just to be sure).
beware the water damage, despite being dry now, will void any warranties. Also, the phone's hardware is now weakened and if you drop it, the green mother board and circuitry could shatter - so be more careful.
This does work on electronic devices aside from phones as well. Simply tailor it to your device. If you do not have a SIM (Verizon phones, cameras, all others), remove only the battery. If you have an iPhone/iPod or GPS and cannot remove the battery, simply make sure it is all the way off, then put it in the rice bag. All electronic devices react the same to the rice trick.
related link is here : http://www.youtube.com/watch?v=0-Otjgd48nY
rate if useful please !
SOURCE: Change TI 84 OS to TI 89 OS??
And why, pray tell, would you do such a thing? You will ruin your Ti84 Plus Silver Edition and will not have a working TI89. Besides, TI connect will refuse to transfer it.
If you like the capabilities of the TI89 Titanium, buy a cheap or used one on e-bay or amazon.com and spare your TI84PLus SE.
SOURCE: my computer won't find my ti-84
Even if you cannot connect it to the computer you can still transfer applications from a working calculator.
Here is a copy of a post I wrote to answer that question.
If
you have a USB SilverLink cable, use it to
connect the calculator though the I/O (round) port.
If you do not
have a USB SilverLink cable, you can use the
mini USB to USB Direct cable but you will have
to install the correct driver for it.
I do not know what computer operating
system you are running and I use Windows XP so I will describe the
installation procedure for Windows XP SP3.
Install TI connect 1.6
for Windows; if your system is Vista you must install a patch available
on the TI website, at the same page where you find TI Connect.
After
you install TI Connect, connect you calculator to the computer with the
mini USB standard USB Direct cable. Windows
will detect the calculator and will try to install the drivers. You will
have something that is similar to what is on the three
screen captures I am inserting in the post. On the last screen, choose
the TI Educational Handheld device and click next.
When
Windows asks to stop installation, click continue anyway 
After the installation, click finish.
Device manager will show
you something like what is on next screen (TI Educational Handheld
device) 
Run TI Connect to verify that the calculator is
recognized. Connect your computer to the Internet and click the Updates
Button on the TI Connect tool bar.
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