i have a m-15 control that the tech thinks the motherboard is bad, does anybody have one for sale. i am a newbee that has this mill as a spare, bought 3 years ago and is still (was in demo) mode ,seldom turned on to lube and home. turned on the other day it gives a series of beeps does nothing and the screen glows but does not go to display mode. any thoughts other than the mother board.