This old Coolpix 950 appears to be in working order -- except that the top selection button PLAY appears not even to turn the camera on. Selections M REC and A REC both work OK and the camera records pictures. Setting PLAY mode produces no image in the topside information window, and the Menu button appears not to work. Does this suggest the whole PLAY module is broken, or did I fail to find in the manual (PDF) some setting that switches this on/off?
I'll second David's suggestion. I've used the same technique on my CP-990. Specifically I used some Radio Shack tuner cleaner/lubricant. Apply a small amount, work the switch back and forth, then turn the camera with the switch facing down to allow excess liquid to drain from the switch. Repeat as needed.
Thanks gents both. (I just wish I had seen these helpful replies before driving 20 km. into town and 20 km. home for an essential lawnmower part, right next to Radio Shack . . . ) Don P