so I wonder if Bunsen's tip about wiring the +5VSB line into the +28V pin would work

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It does work and I used to do it like that but I feel better using closer to the expected voltage and amperage. I have a 20v 4.5A dell laptop power adapter hooked up to my G4. Never had an issue with this adapter, though, it means my G4 now takes three electrical sockets including the display instead of just the previous two. I *should* get a nicely sized piece of wire and some connectors and set it up so I only need one socket but it is just not that big of a deal to me right now.