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I am the dummy.
You were spot on. That was exactly the problem. I got my flashlight out to look underneath at the connections the other day, and noticed the 1/4 connection was still in there. Didn't even realize the headphones came with 1/8 plug and 1/4 adapters. Thank you for the simple solution. I was having nightmares, thinking I had gotten a bad keyboard. You folks responded so rapidly!
And kudos to Kraft Music also, where I purchased the keyboard. They responded right away also. Nice to know there's so much support out there!
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