Steven, If you got the CD's that came with the Cube you could boot from the install CD and run the Disk First Aid application. This may fix some errors on the HDD. Also the drive Set up application has a Test menu item that will slowly test for bad blocks but it's a good exercise for the drive. If the machine came set up from Overstock then it might be an idea to format the HDD and write zero's on it and start from scratch. It could just be a bad directory on the HDD. Though loud clacking noise at start up is usually the drive heads bouncing around which is not a good sound to hear. As it is under warranty it'd be a judgement call to call Overstock and see what they say or do as most of us have done and upgrade the HDD to a larger/faster model. Good luck FrankF Unix for stability. Macs for productivity. Windows for solitaire.--