I have a Victron Multiplus 12/3000/120-50 120V that is only a couple of months old. Worked perfectly until I tried to turn it on via the Digital Multi Control. No lights. No sound. I have 300 Ah of Battle Born LiFePO4 batteries that are fully charged and everything on the DC side works perfectly. Is there a checklist for troubleshooting a totally dead unit? I don't have a Mk3USB and I was wondering if getting one and connecting the Multiplus to a computer will it even show anything if it is totally dead? Thanks for the help!