Try to change the USB cord. There may be a power issue with parlially broken wires if USB cord is weared out. 15 nov 2012 23:52:59 "Ricardo E. Trelles" wrote: > > > > >I have had an i1Pro Rev. D for more than 5 years and have used it >little, mostly to experiment with ArgyllCMS. > >Only now I knew about X-Rite i1 Diagnostics. I just ran version 2.5.1 >of it on my i1 and everything went OK except the "Reflectance drift >test", which failed.