So far form googling this problem I haven't found the answers I was looking for. The problem is that when my MacBook Pro is on and running, and it's plugged in, there is a high pitched crackling, hissing-ish sound coming from the MagSave port/connector area. When I unplug it the sound goes away. Here are my questions. What would be causing it? Should I take it with a grain a salt? One forum sad that it was a problem with the I/O Board. Others said it was a faulty MagSafe connector that did this, and some said it was normal.