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If the TI-84 SE does not function even though you are sure that the batteries are fresh, you can try manually resetting it by following steps: 1. Remove all of the AAA batteries from the graphing handheld. 2. Press and hold the ON key for ten seconds. 3. Replace the batteries. 4. Turn on the unit. When you reset your graphing handheld, the contrast sometimes changes. If the screen is faded or blank, adjust the contrast by pressing 2nd and releasing up-arrow or down-arrow keys.
You probably have your calculator set to display the graph on the home screen. Try pressing MODE and going to the last option, then changing it from "Horiz" to "Full". "Horiz" means it is displaying the graph (probably without axes since your screen is otherwise blank) on half the screen.
sounds like you have dust, sand of some type stuck in the retracting lense. Ive found someone to tell me to take out my batterys and SD card, then tap the bottom of the camera on a table top. Replace the batteries and power up. Doing this, I was told it loosens up the debri for the lense to retract to close and to open again.
This just happened to me, the solution is to wiggle the top half a bit (like you wanna break it, but don't break it.) The root of the problem is a loose wire that connects the two phone parts. Mine still goes blank on me but then i wiggle it... just a little bit...