Im almost certain it is the drive, upon further investigation, i would see the lvb board display go blank for a split second, when the problem occurred, then it would come on again, and display check for fault. the 5 and 15 volt supplies on the board never varied. I don't believe that the display should go blank, if a fault occurs. this is the first ovf30 i have encountered, but i believe if a fault occurs the display should not go blank. any way have a drive on order, will keep you posted