Car wont start!, My starter won't run??? Options

[soulshadow]

Ok heres my problem. When I turn the key in my car. My COR will make a clicking noise, but my starter won't start. The last time I got it to run was before I put in my downpipe to the engine. I hooked up the O2 sensor wire to the engine and started it up and it ran, but since the pipe was leaking gas at the headers I took off the downpipe and it accidently just ploped to the ground with the wires still attached to it. Then after that I went and installed my throttle cable taking out the old one and the cruise control throttle cable so that I can put in the new one that was longer for my 4age engine. Then I tried to start it, but nothing happens!! What went wrong? I checked all the wires and everything was fine. Could it be the starter? I checked it too with a volt-meter and it was ok. Im so confused trying to get that P.O.S to work now.. I NEED HELP!!!