1. power problem: check whether the power adapter is plugged in, whether the power switch of the disk box is turned on, and whether the power cord is damaged. If the power supply is damaged or unplugged, the gs300 Mark levinson CD case will not respond.
2. Connection problem: Make sure all connecting cables are inserted correctly and check whether they are damaged. If the connecting cable is loose or damaged, the gs300 Mark levinson CD case will not respond.