It sounds like your power supply might have died. It goes until the battery runs out, too, then you are truly dead in the water. The partial whirring is the dead battery trying its best...
Is the connector right at the laptop end damaged?? If so, you also might be tripping an internal circuit breaker in the power supply. I've seen one before that you could unplug the power supply, carefully straighten the damaged portion of the cord - and then plug in the supply and run it until someone kinked the damaged spot, tripped the breaker shutting down the supply, etc...
Easy to diagnose if you have another power supply and/or battery to swap out...
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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