Just started wiring up my motors to the ramps board and was wondering if there is a proper powering on sequence?

USB power to arduino then external power supply or other way around?

Or does it not matter?

Hopefully not totally stupid question just didn't want to damage anything

Cheers

It shouldn't really matter, at least it doesn't for me..

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Waitaki 3D Printer

I agree with Waitaki, it shouldn't matter. Having said that I found it did with one printer. USB first then power to ramps. (otherwise the pC would not connect). However I later found that the problem was an earthing one on the power supply and once that was sorted the order problem went away.