Yesterday my wife's 2014 altima would not turn over and she reported that the brake pedal was very stiff. She called me so I drove over to where she was to take a look. I tried to start the car and when I pushed the start button the car made a noise like it was trying to turn over but could not. I drive this car occasionally so I have some idea of how the brake pedal might feel before the engine starts. I could not tell if the brake pedal was unusually stiff. It seemed like maybe the battery was just weak so we decided to try giving it a jump. I connected the jumper cables in the normal manner except making the last connection directly to the battery negative terminal just to make sure I was getting a good connection. The first attempt to jump it was a failure with the same symptom that the engine would not turn over. Before calling AAA for a tow we gave it a second try making sure to wiggle the cable connectors to get a good connection, waiting several minutes with the good car running and also revving the good car when trying to start the bad car. In this case the car did turn over and start. While we were waiting around with the good car running we did check the internet on my wife's phone to see if we might get any advice and we did see several threads which mentioned things like possible bad brake switch, things like pushing on brake and gas pedal while trying to start. Well in this case I wouldn't think it was a bad brake switch since the engine did make a noise and try to start but just didn't have enough oomph to turn over. I didn't think that pushing on the gas pedal would have any effect on starting a car whose symptom was that it was not turning over but when i was trying the second jump attempt i might just have had my left foot on the brake and my right foot on the gas. can't say for sure since my idea was just to have my right foot handy to try pushing on the gas pedal at the same time as pushing the start button so that in the event that it was not turning over i could push done on the gas pedal and see if it had any effect. Anyway it did turn over and start and i couldn't say for sure if didn't give a push on the gas pedal but I don't think so. I think my foot was just resting on it. Anyway, when we go the car home i removed the battery and cleaned up all the terminals. There was quite a bit of greenish corrosion on the positive terminal. I charged the battery and I checked the fluid levels in the battery which were fine. I load tested the battery and it was in the green for it's 550 CCA rating. I put the battery back in the car and the car has been fine for it last 3 starts in trips around town. Right now I'm just thinking that the corrosion on the terminal was was the problem but I'm wondering what anybody else thinks?