On re-reading, I see that the battery angle was already covered. Two further thoughts:
1. Check that the ROM card (under the battery cover, at the right as I recall) is properly seated.
2. Another thing to note is that occasionally a Newton will not turn on until reset. I have had this happen to me more than once with NewtonOS 2 devices, including in one case with an eMate that had been stored for some years and that I bought on eBay. There are two distinct forms of reset possible. I would try both, but would anticipate the need for a hard reset, which is not a bad idea anyway, as it restores the machine to factory defaults. The base software is all in ROM, and more can readily be added, so don't fear the hard reset — and be patient, as it takes a while.
Mind you, it would have to power up in some sense in order to work....
1. Check that the ROM card (under the battery cover, at the right as I recall) is properly seated.
2. Another thing to note is that occasionally a Newton will not turn on until reset. I have had this happen to me more than once with NewtonOS 2 devices, including in one case with an eMate that had been stored for some years and that I bought on eBay. There are two distinct forms of reset possible. I would try both, but would anticipate the need for a hard reset, which is not a bad idea anyway, as it restores the machine to factory defaults. The base software is all in ROM, and more can readily be added, so don't fear the hard reset — and be patient, as it takes a while.
Mind you, it would have to power up in some sense in order to work....