Just got my first iMac 2 weeks ago and it has been working excellent until 2 days ago. I logged on and noticed the drive icon which was originally "Macintosh HD" has renamed itself with a string of numbers. I thought maybe one of the kids was typing on the keyboard and this happened accidentally. I renamed the HDD and today it has changed its name to "620 2,6556569630521521". Does anyone know why this keeps happening? I also noticed that the machine will not fully boot it I have my USB hub connected to the machine when it is booting of logging on a new user. It will come up to an all blue screen and once I unplug the USB Hub, the user log on screen will appear.