I have a PowerMatch 8250 amp that has been working properly for over two years, before closing the store in April for COVID19. This week we have reopened and trying to turn it on. PM8250 has only turned on the limit, signal and clip lights for 15 seconds. Then the amplifier is turned off. The screen never turns on. I would like to be sure that there is nothing I can do before sending it for repair because it is on a Greek island and the shipping cost is considerable. Is there anything I could do before sending it out for repair?