I just received a WD MyBook Pro 250GB Extrenal HD yesterday. It installed fine and I consequently moved all of my music and videos over to then new drive. I was given some bad advice by an Apple Genius about moving my iTunes library and now iTunes won't recognize my old or new library. When I went to open iTunes this morning to continue to recover my library I got the swirling rainbow for numerous minutes and couldn't get it to force quit. I powered off my iMac and since that time my iMac won't recognize my external HD. Any ideas? Thanks.