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The standalone version of the OS for the TI84Plus/TI84Plus SE are not
for TI-Nspire with TI84 keyboard. The 94 Plus part of the TI-Nspire is
updated when you update the OS of the TI-Nspire. The version numbers are
different. To update you TI84 portion of the TI-Nspire, update the OS for the TI-Nspire. Thy are now at Version 184.108.40.2063
It seems to me that you get the loading bar when you switch keypads. I just switched keypads, and when I reinserted the TI84 Plus keypad back again I found my last TI84 Plus screen contents still displayed. As to the RAM cleared message, it probably is related to the batteries being depleted. To verify battery charge level, you may use TI connect.
This is the equation of a circle centered on (0,0) and with radius r=3. You can draw it as a conic section.For that you will need the conics application. Look for it on education.ti.com You can also draw it as two branches: y1=+ square root (9-x^2) and y2=-square root(9-x^2). The two parts may not overlap at the points on the the x-axis, but if you are willing to accept the calculator limitations you will have your graph.
The calculator is showing you its best fractional approximation to the number. To not have it do that, press MODE, up-arrow four times to get to the "ANSWERS:" line, use left/right arrow to highlight "AUTO" then press ENTER. Press 2ND [QUIT] to exit the mode screen.
Do you see anything on the screen? TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.
If that doesn't work, post a comment here and we'll go on from there.
Hello, The Texas Instruments FAQ area of their web site has on such question answered. You may want to read the relevant article. Scroll down the page and look for the part on the TI83/TI84 Plus family. Hope you will find the answer to your calculator's woes.