I have a similar story over the last 10 years - having worked for several schools from primary through to secondary/sixthform. In the end, I specialised in moving schools AWAY from RM and was very successful at it but eventually tired of having to deal with RM incompetence - such as saying that a certain wireless-connected laptop would "DEFINITELY" work with their network, before overhearing them whisper "but we don't have working drivers for that, they just crash the system" (because of their AWFUL packaging / rebuild system on CC3 networks).
One machine arrived, from new, without a motherboard jumper (not even rolling about in the case or anything - just completely missing) that set the processor speed to an invalid value and it refused to do anything except POST-beep. Not the sort of thing you can miss with QA testing. And their custom BIOS defaults to not warning on over-temperature or failed fans.
Three others were sent back to RM several times for repair (by the school, not by me) over six months, each time coming back with the same fault - "CMOS Battery Failed" displaying on startup and not continuing through the POST. 50p each and a new CMOS battery later, there were three fully-working machines (which admittedly worked for several years) and one very happy IT Technician who was given a job on the spot (I was there on a one-day visit to see if I could help solve their RM-related IT problems, ended up working there for 4-5 years).
And I saw *dozens* of machines die the "Capacitor Death" because of the cheap-crap motherboards they use. First the ports start to go, one at a time (usually USB and then network), before the machine eventually dies. Their solution? They install PCI USB and Network cards in them when it happens to eek out another 6 months of use.
I have no end of horror stories from RM, who basically HATE independent technicians who can call their bluff on everything they do, and moved several schools off them over the years. Now I work in a private school, partly because in the interview they said they would never touch anything RM with a bargepole.
Don't even get me started on their application software...