Geez.. how many poor seedlings did I do that too....

Here were the reasons for my causes

1. Crappy Soil
2. Horrible PH
3. Not enough light (I purposefully killed some plants by putting them outside the grow room.)
4. Too much heat.

These were my causes when I was first trying to get seedlings to sprout.

Most of my problems were resolved with a PH pen, Very good soil, and some cooling..