The down arrow seems to be "stuck". I say "seems to be" as I've unplugged the keyboard, unpaired the mouse and am using only my bamboo dock to get around my iMac and yet it keeps running through every selection I try to make....complete with the repetitive sound as it reaches the end of the list. Is there a virus associated with this type of behaviour?
iMac, Mac OS X (10.6.8)
I have the same problem, except my delete key "appears" stuck, I can't enter text as it's automatically deleted and I get that annoying end of line sound as well. I have bootcamp and this problem doesn't occur in Windows, just OS X, so it's unlikely a hardware problem. It seems to begin about 10 minutes after start-up.
No virus, just restart the computer doing a SMC reset, directions for doing so are in https://discussions.apple.com/docs/DOC-3603
At first I thought it had fixed it, but its still scrolling down through. I've unplugged the wired keyboard, and successfully paired the wireless with the same issue.
I had this problem, then I realized that there was a wireless Apple Keyboard on a bookshelf in another room. Someone put something over it which was leaning along the bottom row of keys.
arrow down key "stuck"
