Check the negative connection especially. There have also been some FFs who reported finding a 175a fuse in the positive cable near the battery terminal. You might want to do a continuity test.
If it won't jump at all, your battery might be so bad that you can't get enough juice from the other person's battery to get the car to start- or one of the cables is not connected very well. It can be loose at the terminal or at it's connection elsewhere- like the starter for the positive cable, and the engine/trans for the negative.
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