Not stepping up input voltage

My A2337 isn’t stepping up the input voltage from 5V to 20V.

I’ve tried taking it into DFU but I think the USB ports are not providing I/O at any point meaning it’s not registering on the host computer. Is there another reset that I can try?

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crwdns2889612:0crwdne2889612:0 0

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Are you using this computer with its original power supply?

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@andrewsawesome No, I've tried a couple of different Apple PSUs but not an original one (it didn't come with one).

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