Car Won't Start (searched already)

Okay, before anyone starts bashing, I’ve searched already and could not really find anyone else with an issue similar to mine. And if you’re able to find one to prove to me that I didn’t search hard enough, more power to you. Anyway, now onto my issue.

Like the title says, car won’t start. Details: It all happened last Sunday (last Sunday of July 2007). I got up early in the morning around 6 to go somewhere. I started the car and let it idle for a good 10 minutes or so as usual. The car started fine. Drove it for about 10 minutes (did not turn off the car at any time) and came back home. Parked the car for pretty much the rest of the day under the shade. Later during that evening, I went back outside to go start the car. It wouldn’t start. The starter would only knock ONCE whenever I try to start it, but nothing else would come to play. I have power and fuel, but the starter would only knock once then that’s it. No crank or whatsoever. Initially I thought it was the starter. So I’ve already gone through TWO new starters yesterday and it’s still doing the same thing. I’ve checked all the fuses and there is nothing blown. If anyone has any input as to what could be wrong, please let me know. Thank you all in advance.