'Contact service' message after long time storage

I got a nokia 6310i i would like to upgrade to (coming from 3310). After taking it out and testing the battery to make sure it still works (it does), i tried turning it on. But it dispays Contact Service for a few seconds after which it turns back off.

Any ideas are welcome (thank you!)

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Excerpt in a Nokia shop to repair, computer software is no longer availble. Best you can do is just use for parts - or give to me.

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Ok thank you. I would give it to you, but it's something very sentimental to my dad. So i'm afraid that won't work.

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