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I wonder if some dirt or liquid got spilt on the keys? I would try removing the case and cleaning at the bottom of the keys. What do you have to loose. Of course, if it is new, I would return it before I attempt a repair.
HP lists on their site (and in user manual) a way to run a key test to see which keys are bad. I'd start there.Type "hp 12c key test" into your search window on your browser and the first thing that comes up should answer it. Took me about 4 seconds to find this.
Hi if non of the keys are working dont install the OS its possible that one of the keys is stuck or some acid from the battery is leaked inside if you can open the calc check for spots of liquid or acid
This depends on the keyboard, but there should be a key marked "num lk" or similar for "number lock". Press this key in conjunction with one of the shift keys, probably the one marked "fn" if there is one.
Remove the rear cover and take out all of the batteries. Use a can of
air to blow each of the keys to make sure that nothing is stuck that you
cannot see with the ***** eye. Let it sit for 3 minutes and then
reinstall the batteries. Your keys sound like they got pushed in from
some objects in the bag.
Remove the rear cover and take out all of the batteries. Use a can of air to blow each of the keys to make sure that nothing is stuck that you cannot see with the ***** eye. Let it sit for 3 minutes and then reinstall the batteries. Your keys sound like they got pushed in from some objects in the bag.
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 from there.
Even you turn off then turn on the calculator, the 'E' still there?
As I know, when 'E' display, if any key is stuck (press the key and it never pop up), all other entries will be ignore, until u release the key stuck.
And, please confirm the printer is not stuck.
This just happened to me. Running my fingers over helped because the problem was caused by a 'stuck' key. Sometimes it is clearly stuck to down but othertimes it is pretty hard to tell. Regardless when a key is pressed you can't press any of the others until it becomes unpressed.....so one thing to try is to hit the back of the calculator until the keys are all unstuck.
one of your keys stuck inside try to push all keys with your hand many times bring a good brand contact cleaner from (radio shack) or another electronic store and spray above all the keys while you are pressing the keys many times.(use dry contact cleaner)