I tried taking it to the dealer for servicing.  no use. they cannot fix it.   I called marshall and they said they have none in stock to replace and to ship it to their HQ. 

the point is,  it starts up and when playing guitar.,  all of a sudden there is a ringing sound that gets way too loud and I have to restart the system.  So, essentially it cannot be used on a stage at all 

damn.