I had an annoying little problem last night - and I thought I would share my results in case someone else has the same issue. With the snow and ice we've had recently the roads have been very rough, so everything is getting shaken around pretty hard. All of a sudden yesterday I had a picture on my 700TSV, but the touchscreen wasn't responding. I could unplug it and plug it back in (to the USB port), but then it would say that a device attached to the system has malfunctioned. What I ended up doing was unplugging the harness at the monitor itself and reseating it. Works fine now, so it must have jiggled loose.