The HP 32SII calculator has a very common problem with the keyboard connections. There might be nothing else wrong with the calculator except the contacts.
Try pinching the calculator just below the middle of the screen above the [LN] and [Y^x] keys while pushing the [C] button to power it on.
If this worked, at least you know where the problem is. Fixing that problem temporarily, some users wrap a rubber band around the calculator at that point and put something under it to keep pressure on that spot.
The longer-term fix is harder and involves taking the calculator apart to replace a foam pad to keep pressure on the plastic keyboard contact strip against the printed circuit board contacts.
Somebody (not me) put together an Instructables page for the HP 17B calculator, which is built exactly the same as the 32SII.
HP 17b series calculator repair
I had the non-contacting problem (not as bad as Anonymous) for six months. A month or so ago I tried putting the calculator on a hot-water radiator for a couple of hours. Since then it has worked perfectly.
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