Multiplus 48/3000 not switching on

hi guys…today after using my easysolar for 7 years…it went off. Checked No over-heating, no short-circuits…it couldnt start again. Using VEflash, I upgraded the firmware to 2620552…no change. It makes a continuous clicking sound, unable to connect to AC POWER line in. Victron connect app can see it and change settings. Help