not running in your engine can cause major problems

your engine will have a much shorter life, it will not perform as well it should do for the rest of its life & you may find it more difficult to tune/start, running a nitro engine in is essential, running an engine in allows the components of the engine to "bond together" so to speak, it allows all the parts to run smoothly etc.. think of it as a bicycle chain :P

a dry bicyle chain is stiff & you can feel the resistance when u try to turn the peddles by hand... an oiled chain after you have turned the peddles few times makes it turn alot smoother with very little resistance :-) ...although a nitro engine aint a chain, i think you get the idea now :-)

As for weather or not its blown your engine, i doubt it, but then it depends how hard you have ran it, if you have had it on WOT on your 1st tank of fuel this s the worse thing to do :P

if it aint starting check ya glow plug, check fuel is going to the carb when u prime it etc, easy way to see is take air filter off then prime it...if you see fuel spitting into the carn you know its not a fuel blockage/prime problem & more likely the glow plug/starter or summit to do with the ez start

in future ALWAYS run-in a new engine!