OK, how do I tell if the temperature killed them? Advise?

I had run the incubator for 3 days with a solid 100 degree temp. Put the eggs in on wed night and checked them, still good. (I have a fan in a homebuilt bator. In the morning, temp still fine. Called and had my nanny check the temp, she says right at 100, that was about noon. Got home from work, checked and the temp was almost at 105. How soon would I be able to tell if this killed them or not. These particular eggs are ones that are in front of the fan. Now that I am worried, I opened some holes in the bator and is has been running at 98 since then with no temperature spikes, but I am trying to figure out if I need to start all over or not, but have never candled before. I think what screwed things up is the nanny left the door open for the dogs to go in and out and the room heated up in the afternoon. Since it is so early, what am I looking for to determine live or dead? These are turkey eggs by the way.