The calculator won’t turn on.

I got a broken calculator from my math teacher and I need help fixing it. The calculator refuses to turn on so I opened it up and checked the continuity between the battery pads and the buttons. Nothing showed up on my multimeter. Can someone please help me?

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And the batteries are at full charge?

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@jmehnert Yes. I changed the batteries recently

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And if you plug the device into a computer through the I/O port, does the computer see the device?

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@jmehnert I do not have a cable to plug it into a computer

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