Particular is not very intuitive. If you are new to the plug-in I wold strongly recommend that you visit the Red Giant site and go through some of their tutorials.
To quickly find out what properties you have messed with that may be fouling up your scene select the particular layer and press the u key twice. The timeline will expand and show you everything that has been modified. Start resetting properties until some particles appear. Without knowing which parameters you have adjusted it is impossible for us to tell what may be going on. If you are still lost send us a full screen screenshot so we can see what you have changed.
Well as per your own thread title:
only (No DOF) Particle Types work ??
Chances are everything is working just fine, but your particles are already "blurredaway" by too much DOF, get clipped away because of camera focal length settings or you simply don't have a suitable 3D camera in the first place. For any specific advise screenshots and detailed info about settings will be required.
Did you ever solve your Particular Issue? If so, what did you end up doing? If not, please let us know more details so that we can assist.