I was going to suggest the same thing, Jenny. More than likely they'll want to you bring the computer back in, if they're worth their salt.
If they do have to bring the computer back, take your mouse with you. Have them hook the computer to a monitor and using your mouse, show them what's it is/was doing. That way they can get a first hand look at the problem.
If something gets your goat, it just proves you have a goat to get.