Insignia™ 6' AC Power Cable Black NS-PW06501 - Best Buy
I'm guessing it's an Underpowered Amp with power-stiffening caps that are way too small. I found photos of the E40-C2 and D24h-C1 motherboards online (because the D1 is so new, it was unavailable) and the caps near the 4 220nH output inductors (bottom left on each board) do look smaller on the D24.
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