Wall plug was damaged during an incident of unauthorized use by one of my resident knuckleheads.  The plug was snatched out of the wall but ground prong did not come with it.  I would like to repair vs. replace sincere ordinarily this is such a simple fix.  Unfortunately, I am unfamiliar with DELLs or their vendor's choice of wiring colors.  So I'm not sure where each of the purple, blue and yellow conductors should be landed on the replacement plug.