Summary: I purchased this unit 3 months ago. A reputable tech company is installing a new hard drive as we speak and restoring my data(fortunately, I backed up before crashing completely). Tech said there are several bad sectors on drive, and that the hard drive that the refurbishers put into this unit was, itself, refurbished. I expected a refurbished computer (it's modular, after all). But a refurbished hard drive is just asking for trouble.