how wet was your paper towel? You dont want them too wet or dry, and you dont want them to get overly warm or you will kill the seeds. Alot of people will put the plastic bag between two plates and place them on their cable modem since its warm. What you can try is taking a couple of your seeds and place them in your medium and see if some will pop that way. How long have they been in the paper towel, some can take up to a week to germ.