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If it came back on when you moved the tower, there is a good chance that the problem was a loose connector or a cable with a bad internal connection from crimping the cord in the previous location
– fixer1234
Commented Dec 28, 2014 at 4:36
I had this problem, and it also ended up being hardware. Dell replaced motherboard and DC-in cable, and problem went away. No software changed.
– Nik
Commented Jun 8, 2016 at 10:41

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