If it didn’t boot at all with the USB A-A it might not be a PSU issue. It could be an issue with CPU cooling.
Anyway suggest to watch it and if unsure just get a backup PSU.
Some time agao @sam_nazarko provided some links how to order them within the osmc shop, see his post
https://discourse.osmc.tv/t/vero4k-power-supply/87080/5
Other way would be to get one somewhere else, specification: DC 5V, min. 2A, center positive, coaxial power connector male with OD 5.5mm and ID 2.1mm