I have fixed several TI calculators for a school that had loose or corroded battery contacts. Cleaning the contacts and bending them a bit to get a good grip on the batteries got them going. You can try this on yours and see if you have any luck. Also try another set of batteries on the off chance one of the new ones you installed is bad (it does happen, and isn't one of the first things you'd think to check) or use a battery tester. If the batteries are good and the calculator still doesn't work, something inside has failed. Either go for the refurb or (if that specific model isn't required for school) see what similar brands and models are available. There might be something suitable for less than the TI price.
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