I'd check the label on each power supply brick and see what each is rated for.
On my heated bed upgrade to my UMO, I really had to screw down hard on the terminals to make a good connection. When I was reading your post, I was thinking you might have had the same issue I had. But if you have a weak power supply, that'll cause problems!
Sort-of fixed it by now. I connected the original power supply next to the power supply from the HBK. So I guess for some reason, the HBK PSU does not deliver enough power.
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