I'm a senior and have had my TI-84 plus for four years now. I just went back to school and tried to use my calculater for the first time in two weeks but it won't turn on. I've switched the batteries around and put newer ones in but had no luck.

good luck

Press MODE, highlight "NORMAL" on the first line and press ENTER. Optional: highlight the desired item on the second line and press ENTER. Press 2ND QUIT to exit the mode screen.

Turn the calculator on. Press and release the 2ND button. Press and hold the up-arrow button to increase the screen contrast. If you go too far, use the 2ND and down-arrow buttons to decrease the contrast.

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 this doesn't do it, please reply to this post and we can go on from there.

That is the right result: 2x2 is 4 times 10 to the 0th power. But if you don't want your answer in scientific notation, press MODE, highlight NORMAL on the first line, press ENTER, then press 2ND [QUIT]. (You can also select the number of digits on the second line, or FLOAT and let the calculator choose.)

Your sure every battery was put in correctly and was good? When I first got mine I thought I had the batteries in correctly but, I didn't.

try adjusting the contrast up using 2nd + up
just keep pressing it and it should turn back

I went to Office Max and they told me for FREE what batteries go in my old calculater.

type 15 then click a button that looks like this^. then 365. Then hit enter. it is like a normal clcutor except with more function. Sometimes you need to use the 2nd and the alpha button to do some functions.