I recently picked up an Apple II plus, which the original owner told me was working the last time he had used it (many years ago). When I turn it on it looks like it is trying to display the apple banner but most of the characters are missing, the computer doesn't beep on boot either. I tried reseating most of the chips and removing any extra cards which didn't seem to make a difference. I'm not sure if there is a bad ROM or something, but was hoping to get some ideas of what I could try next. I attached a picture of what it looks like when I turn it on. Thanks I appreciate any help.