Lois did you check the actual temperature in the bator aka calibrate the digital against a real thermometer at any point? Is that incubator with or without a fan?
The entirely dark egg is the one most likely to hatch. See through eggs didn't go or stopped early.
To check your actual bator temps you - use play dough or silly putty or that flour dough you make for kids, make a ball egg sized and wrap it in plastic so it doesn't dry, set it in the incubator for 3-4 hours. Then insert a medical thermometer into the dough and check the temp. That is YOUR accurate temperature maintained by your incubator. Compare that to your digital thermometer or the incubator's readings whichever you have. Write the difference on the inaccurate thermometer like +.5 or - one... so you remember to add or subtract to get actual.
If your incubator is still air and you ran it at 100 degrees it ran too cool. Temps for still air should run 101-102.
You also need to change the batteries for the thermometer every hatch. Bad batteries = bad readings.
Humidity we're going to ignore for now, I dry hatch, that's not a problem here.
Candle the egg again. First the air cell end and look for moving shadows in the air cell...
Then candle the other end - if there's a clearish yolk area it's not ready to hatch. Watch that area for along while sometimes you can see movement there. That area usually goes completely black once the yolk is totally absorbed...
If no movement - go up to the Read ME ON HATCHING thread, and find the thread on Helping a chick out, follow the instructions to take a peek inside.
I hope there's still hope. Good luck. And whatever happens - read all the links in the huge read me on hatching file for future hatches and you'll get there...