YAMAHA RS7000 Groovebox Sequencer Rhythm Machine Workstation - Needs Repair

Description

Yamaha RS7000 Groove Production Station.  Includes power cord and original "Tools & Styles" CD-ROM.  This unit is in very good cosmetic condition, with few scratches or blemishes.  The white buttons do have a good deal of yellowing.  I am unsure if this is from smoke or from UV, but the unit does not smell smoky at this point.  It is missing a rear cover plate.
Functionally, the unit needs repair.  The screen illuminates when the unit is turned on, but only displays two vertical lines.  I do not know what the issue is.  So please understand that it is sold as-is.
Thank you.