Well I'm still having the same problem. I'm thinking maybe I should reburn the bootloader but don't know how. Are the bootloaders the same in all the same boards? I have 3, uno 3 boards and none of them work. I retried my nano with old bootloader and it did upload but I can't check if it works cause I need the uno for that..I know I'm a pest but at 83 yrs old this is what makes My days interesting.