A year ago we bought my folks a used computer to run e-mail. Since they are at a cottage in the summer and move home in the winter they had to move the computer without us. We used my teenage daughters nail polish on all the cords and connections. (There are wonderful colors out there that are VERY easy to see!) Worked like a charm. My father-in-law has bright red marks on his oven controls. We humans are a resourceful bunch! Jean Casper, WY