Gary,
I'm sorry to hear about your camera troubles.
Unless your digicam is suffering of 'sudden death', it could be just a bad glitch like every computer has from time to time.
Just try to replace the batteries or a new memory card. Sometimes it's just as stupid as that.
About the 'Coolpix' name, it encompasses just everything from beginner to pro level, with all the differences in quality, performance (and price) you can imagine. Usually the three digit (885) number indicates the more affordable range, while the 4 digits (5700) are the top of the line.
Furthermore, every 'new' model only lasts ONE year or so before being replaced with something more 'perfoming' (and more expensive). So the best and cheapest way to buy a digicam is to pick your choice and wait until it's on the verge to be replaced, for the price to drop (usually 40-50%).
Ah, the joys and woes of digital photography.
Best wishes,
Q.