What's wrong with my car? - 3

2002 Honda oddessey. Yesterday It sounded like a belt might need replacing a sound I've heard on other cars all the time but it was running fine. I started driving to work this morning and all of the sudden it cuts off. I stop it and the electrical system struggles to start again and now I'm hearing a whining sound so I head straight to the mechanic but it cuts off again and locks up and I can't even get the gears to switch so I can toe it!

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