Starter motor

Hey, a while ago my car started doing this weird thing were when i turn the key to start it, it would make this loud klunk noise and not turn over. After about turning the key back and forth it would eventualy start. For a while i thought it was the alarm system or something not letting the car turn over unless i press the key. Then i relized its either the starter or the starter syloniod and i just recently replaced the starter my self. It wasn't as hard as everyone says it is and got it done in about 2 hours including an oil change. Whent to start the car and started right up. Just today at school i go to start it and it does the stupid klunk thing but only thing time the car wouldn't start. so now im' pretty pissed off and confused because i need the car and now i have to spend money to get it towed and looked at.

Anyone that has any idea what is going on please let me know.

Thanks

klunk, like (trrrrrrrrrrrrrr) when turning the key?
If that is the case could be a low voltage battery. Did you try jump starting?

I figured it out. Bad starter from national auto. I got a more expensive one from napa and it works fine. I was kinda worried it was something else but now it works fine. Thanks though

Cool