The Command system on my elderly but pristine Mercedes E Class failed completely. Nothing but a black screen and transient logo. I was unhappy with both the diagnosis and the very high quote from my local dealer. The dealer had the vehicle for 2 days and told me that a technician spent several hours trying to find the fault.
Neil pinpointed the problem in 10 minutes, replaced a component from refurbished stock and had the system reassembled and in full operation inside of an hour.
I was absolutely delighted!