It doesn't turn on and there where black lines on the screen what do I
It doesn't run on and when it did it had a black triangle and you couldn't see the numbers
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To assess your problem, open up the back and check for the following:
1. It has water damage >>>>> buy a new one, fixing it will cost more.
2. >>>>> It has taken physical damage ( dropping it, sitting on it, etc. ) buy a new one. It will take a fortune to replace the internal components now.
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First, check the batteries.
If they are good, probably just get a new one as fixing those can be expensive.
If you want, get a working one off of ebay and if your case looks better, do a part swap to make one good looking and functioning calculator.
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