That sounds like a real good story for PC lovers. There are a variety of virus software programs made for Mac so Mac viruses are possible and you really don't think Apple knows this? Now for her specific case, if she had taken it into a genius bar, she could have told them the symptoms and they would have investigated and try to duplicate the problem. I challenge any PC lover here to show me a verified quote from Apple saying Mac viruses are not possible. I've only had one virus on any Mac I've owned since 1993. It was a Windows based virus found in an email attachment that did not run on the MacOS. So viruses are definitely possible.