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First thing to do is lift the hood and make sure the drive belt is on it. Sometimes a failing alternator will begin by making the slight screech on start up, then just stop charging. If the bearing seized up in it, then you would get a heck of a noise and if the battery wasn't being charged, it might not want to start.
Please check the belt and let me know what you see.
Were you running the a/c at the time. It's possible the air conditioning compressor seized up. If the belt doesn't burn off, then it can prevent the engine from cranking. If you can, remove the drive belt, then see if the engine will at least crank. If it does, then you can turn it off if it starts and try spinning the pulleys by hand to make sure they still spin for you.
Let me know.
Well,when you can, get the belt off and see if she will crank. If not, then you will have to put a socket on the crank pulley bolt and make sure you can turn the engine by hand.
I got a sneaking hunch the air compressor might have seized up. I have seen this happen on a lot of vehicles.
Understand, but if the bearing in the compressor fails, it'll lock you right up.
I am not counting out the alternator either, but it seems like it's fairly new so of the two the a/c seems more likely.
Honestly though, I don't trust the aftermarket alternators.
I hadn't heard back from you so I thought I would check and see if you needed further assistance with this or not?