From Elbox:
This connector is not necessary.
It is only the additional power supply. In most configurations the regular supply is sufficient.
So, I'm hesitant to fire it up with all the gadgets that I have plugged into it...what do you guys think?
Well, on my A4000 without that power all std. amiga ports dosne't working. Audio, serial, parallel dosen't work at all.
Mediator and all card inside work ok.