Thanks very much for the reply - the only thing I get is the yellow error light - no other signs of life, no lcd, no codes - the service manual site seems to be down now, I'll try Monday - there was a comment in your linked thread that a bad print head might prevent the printer from powering up...
My mx860 shows yellow error light and will not power on using any button(s) (on,
ok, etc). Found printer in this status one morning - it was working fine day before.No power hits, outages. Can't find anything much helpful online - all results say if you get this condition replace power module...