After an intense plinking session (lol) my TM USP springer will not fire anymore

Odd, since my new TM Glock 17 just got here today as well - so I am not left without any springer for some plinking action
That being said, I'd still really like to know why it is not firing anymore. There used to be a bb inside the gun, but I have since dislodged it and now it appears that nothing is inside the gun. I've tried looking for a technical manual so I could maybe try to disassemble the thing here and online in general, but the closest thing I could come up with was a TM M9 documentation.
The gun is at a really odd state right now - if I can somehow get the safety of the gun to go "on" (by making the hammer go down manually, without cocking), and I actually go ahead and cock the thing with the safety on, it does NOT fire when i press the trigger, but rather, it DOES fire when i force the safety down into the off position. In other words, I dont use the trigger to fire, but rather the safety switch :-?
Any ideas/documentation/help?
Much appreciated.