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First, what a dead display looks and sounds like. Hear the high pitch sound? That's the inverter, unplug it. Updated display with wonderful back-light

Following the Service Manual one is able to bring the MC-307 back from a non-responsive state. Service Manual: https://www.synthxl.com/offwp/roland_mc_307_service_notes.pdf Roland MC-307 Data and Manual: https://www.roland.com/us/products/mc-307/downloads/ Bome Software Send SX: https://www.bome.com/products/sendsx "grab" switch replacement: https://www.ebay.com/itm/144312643901 Tactile Switches: https://www.ebay.com/itm/144017193479