TODDLER NAPPING TROUBLES!

It's been hard these last couple of weeks for some reason something changed after my son's 2nd Birthday. at first we thought it was because he got a cold and felt so congested. Nothing changed after getting better. He just wont nap anymore, he screams and cries the entire time he is in his crib. We have tried changing his nap to earlier, later and nothing. we calmly explain it is time to rest we set the mood with his sound machine, turn the shades down a bit. As a usual routine since day one. He obviously is tired and cranky and is fighting so much. Its truly frustrating because I don't know what else to do. If any mommies are out there dealing or have dealt with this situation please pass some info on what has worked for you guys. I'm so desperate at this point and I'm willing to try anything. I think he's too young to drop the day naps already. By the way he sleep through the night from 8:30-7:30 or 8:00 am. Please help a mommie out! Thank you!